159 lines
5.8 KiB
Scala
159 lines
5.8 KiB
Scala
package rocket
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import Chisel._
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import Node._
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import Constants._
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import scala.math._
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class ioMemSerialized extends Bundle
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{
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val req = (new FIFOIO) { Bits(width = MEM_BACKUP_WIDTH) }
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val resp = (new PipeIO) { Bits(width = MEM_BACKUP_WIDTH) }.flip
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}
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class MemSerdes extends Component
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{
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val io = new Bundle {
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val wide = new ioMem().flip
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val narrow = new ioMemSerialized
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}
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val abits = io.wide.req_cmd.bits.toBits.getWidth
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val dbits = io.wide.req_data.bits.toBits.getWidth
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val rbits = io.wide.resp.bits.getWidth
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val out_buf = Reg() { Bits() }
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val in_buf = Reg() { Bits() }
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val s_idle :: s_read_addr :: s_write_addr :: s_write_idle :: s_write_data :: Nil = Enum(5) { UFix() }
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val state = Reg(resetVal = s_idle)
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val send_cnt = Reg(resetVal = UFix(0, log2Up((max(abits, dbits)+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH)))
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val data_send_cnt = Reg(resetVal = UFix(0, log2Up(REFILL_CYCLES)))
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val adone = io.narrow.req.ready && send_cnt === UFix((abits-1)/MEM_BACKUP_WIDTH)
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val ddone = io.narrow.req.ready && send_cnt === UFix((dbits-1)/MEM_BACKUP_WIDTH)
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when (io.narrow.req.valid && io.narrow.req.ready) {
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send_cnt := send_cnt + UFix(1)
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out_buf := out_buf >> UFix(MEM_BACKUP_WIDTH)
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}
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when (io.wide.req_cmd.valid && io.wide.req_cmd.ready) {
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out_buf := io.wide.req_cmd.bits.toBits
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}
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when (io.wide.req_data.valid && io.wide.req_data.ready) {
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out_buf := io.wide.req_data.bits.toBits
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}
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io.wide.req_cmd.ready := state === s_idle
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io.wide.req_data.ready := state === s_write_idle
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io.narrow.req.valid := state === s_read_addr || state === s_write_addr || state === s_write_data
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io.narrow.req.bits := out_buf
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when (state === s_idle && io.wide.req_cmd.valid) {
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state := Mux(io.wide.req_cmd.bits.rw, s_write_addr, s_read_addr)
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}
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when (state === s_read_addr && adone) {
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state := s_idle
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send_cnt := UFix(0)
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}
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when (state === s_write_addr && adone) {
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state := s_write_idle
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send_cnt := UFix(0)
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}
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when (state === s_write_idle && io.wide.req_data.valid) {
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state := s_write_data
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}
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when (state === s_write_data && ddone) {
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data_send_cnt := data_send_cnt + UFix(1)
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state := Mux(data_send_cnt === UFix(REFILL_CYCLES-1), s_idle, s_write_idle)
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send_cnt := UFix(0)
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}
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val recv_cnt = Reg(resetVal = UFix(0, log2Up((rbits+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH)))
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val data_recv_cnt = Reg(resetVal = UFix(0, log2Up(REFILL_CYCLES)))
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val resp_val = Reg(resetVal = Bool(false))
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resp_val := Bool(false)
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when (io.narrow.resp.valid) {
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recv_cnt := recv_cnt + UFix(1)
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when (recv_cnt === UFix((rbits-1)/MEM_BACKUP_WIDTH)) {
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recv_cnt := UFix(0)
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data_recv_cnt := data_recv_cnt + UFix(1)
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resp_val := Bool(true)
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}
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in_buf := Cat(io.narrow.resp.bits, in_buf((rbits+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH*MEM_BACKUP_WIDTH-1,MEM_BACKUP_WIDTH))
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}
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io.wide.resp.valid := resp_val
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io.wide.resp.bits.tag := in_buf(io.wide.resp.bits.tag.width-1,0)
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io.wide.resp.bits.data := in_buf >> UFix(io.wide.resp.bits.tag.width)
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}
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class MemDessert extends Component // test rig side
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{
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val io = new Bundle {
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val narrow = new ioMemSerialized().flip
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val wide = new ioMem
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}
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val abits = io.wide.req_cmd.bits.toBits.getWidth
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val dbits = io.wide.req_data.bits.toBits.getWidth
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val rbits = io.wide.resp.bits.getWidth
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require(dbits >= abits && rbits >= dbits)
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val recv_cnt = Reg(resetVal = UFix(0, log2Up((rbits+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH)))
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val data_recv_cnt = Reg(resetVal = UFix(0, log2Up(REFILL_CYCLES)))
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val adone = io.narrow.req.valid && recv_cnt === UFix((abits-1)/MEM_BACKUP_WIDTH)
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val ddone = io.narrow.req.valid && recv_cnt === UFix((dbits-1)/MEM_BACKUP_WIDTH)
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val rdone = io.narrow.resp.valid && recv_cnt === UFix((rbits-1)/MEM_BACKUP_WIDTH)
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val s_cmd_recv :: s_cmd :: s_data_recv :: s_data :: s_reply :: Nil = Enum(5) { UFix() }
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val state = Reg(resetVal = s_cmd_recv)
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val in_buf = Reg() { Bits() }
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when (io.narrow.req.valid && io.narrow.req.ready || io.narrow.resp.valid) {
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recv_cnt := recv_cnt + UFix(1)
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in_buf := Cat(io.narrow.req.bits, in_buf((rbits+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH*MEM_BACKUP_WIDTH-1,MEM_BACKUP_WIDTH))
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}
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io.narrow.req.ready := state === s_cmd_recv || state === s_data_recv
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when (state === s_cmd_recv && adone) {
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state := s_cmd
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recv_cnt := UFix(0)
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}
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when (state === s_cmd && io.wide.req_cmd.ready) {
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state := Mux(io.wide.req_cmd.bits.rw, s_data_recv, s_reply)
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}
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when (state === s_data_recv && ddone) {
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state := s_data
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recv_cnt := UFix(0)
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}
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when (state === s_data && io.wide.req_data.ready) {
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state := s_data_recv
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when (data_recv_cnt === UFix(REFILL_CYCLES-1)) {
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state := s_cmd_recv
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}
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data_recv_cnt := data_recv_cnt + UFix(1)
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}
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when (rdone) { // state === s_reply
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when (data_recv_cnt === UFix(REFILL_CYCLES-1)) {
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state := s_cmd_recv
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}
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recv_cnt := UFix(0)
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data_recv_cnt := data_recv_cnt + UFix(1)
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}
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val req_cmd = in_buf >> UFix(((rbits+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH - (abits+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH)*MEM_BACKUP_WIDTH)
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io.wide.req_cmd.valid := state === s_cmd
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io.wide.req_cmd.bits.tag := req_cmd
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io.wide.req_cmd.bits.addr := req_cmd.toUFix >> UFix(io.wide.req_cmd.bits.tag.width)
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io.wide.req_cmd.bits.rw := req_cmd(io.wide.req_cmd.bits.tag.width + io.wide.req_cmd.bits.addr.width)
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io.wide.req_data.valid := state === s_data
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io.wide.req_data.bits.data := in_buf >> UFix(((rbits+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH - (dbits+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH)*MEM_BACKUP_WIDTH)
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val dataq = (new Queue(REFILL_CYCLES)) { new MemResp }
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dataq.io.enq <> io.wide.resp
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dataq.io.deq.ready := recv_cnt === UFix((rbits-1)/MEM_BACKUP_WIDTH)
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io.narrow.resp.valid := dataq.io.deq.valid
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io.narrow.resp.bits := dataq.io.deq.bits.toBits >> (recv_cnt * UFix(MEM_BACKUP_WIDTH))
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}
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