riscv/rocket-chip
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parameterize width of MemSerdes/MemDesser

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This commit is contained in:
Andrew Waterman 2012-10-18 16:56:36 -07:00
parent 9df5cfa552
commit ffda0e41a9
1 changed files with 28 additions and 26 deletions
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54
uncore/src/memserdes.scala
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@ -6,17 +6,17 @@ import Constants._
import scala.math._
import uncore._
class ioMemSerialized extends Bundle
class ioMemSerialized(w: Int) extends Bundle
{
val req = (new FIFOIO) { Bits(width = MEM_BACKUP_WIDTH) }
val resp = (new PipeIO) { Bits(width = MEM_BACKUP_WIDTH) }.flip
val req = (new FIFOIO) { Bits(width = w) }
val resp = (new PipeIO) { Bits(width = w) }.flip
}
class MemSerdes extends Component
class MemSerdes(w: Int) extends Component
{
val io = new Bundle {
val wide = new ioMem().flip
val narrow = new ioMemSerialized
val narrow = new ioMemSerialized(w)
}
val abits = io.wide.req_cmd.bits.toBits.getWidth
val dbits = io.wide.req_data.bits.toBits.getWidth
@ -27,14 +27,14 @@ class MemSerdes extends Component
val s_idle :: s_read_addr :: s_write_addr :: s_write_idle :: s_write_data :: Nil = Enum(5) { UFix() }
val state = Reg(resetVal = s_idle)
val send_cnt = Reg(resetVal = UFix(0, log2Up((max(abits, dbits)+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH)))
val send_cnt = Reg(resetVal = UFix(0, log2Up((max(abits, dbits)+w-1)/w)))
val data_send_cnt = Reg(resetVal = UFix(0, log2Up(REFILL_CYCLES)))
val adone = io.narrow.req.ready && send_cnt === UFix((abits-1)/MEM_BACKUP_WIDTH)
val ddone = io.narrow.req.ready && send_cnt === UFix((dbits-1)/MEM_BACKUP_WIDTH)
val adone = io.narrow.req.ready && send_cnt === UFix((abits-1)/w)
val ddone = io.narrow.req.ready && send_cnt === UFix((dbits-1)/w)
when (io.narrow.req.valid && io.narrow.req.ready) {
send_cnt := send_cnt + UFix(1)
out_buf := out_buf >> UFix(MEM_BACKUP_WIDTH)
out_buf := out_buf >> UFix(w)
}
when (io.wide.req_cmd.valid && io.wide.req_cmd.ready) {
out_buf := io.wide.req_cmd.bits.toBits
@ -68,19 +68,19 @@ class MemSerdes extends Component
send_cnt := UFix(0)
}
val recv_cnt = Reg(resetVal = UFix(0, log2Up((rbits+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH)))
val recv_cnt = Reg(resetVal = UFix(0, log2Up((rbits+w-1)/w)))
val data_recv_cnt = Reg(resetVal = UFix(0, log2Up(REFILL_CYCLES)))
val resp_val = Reg(resetVal = Bool(false))
resp_val := Bool(false)
when (io.narrow.resp.valid) {
recv_cnt := recv_cnt + UFix(1)
when (recv_cnt === UFix((rbits-1)/MEM_BACKUP_WIDTH)) {
when (recv_cnt === UFix((rbits-1)/w)) {
recv_cnt := UFix(0)
data_recv_cnt := data_recv_cnt + UFix(1)
resp_val := Bool(true)
}
in_buf := Cat(io.narrow.resp.bits, in_buf((rbits+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH*MEM_BACKUP_WIDTH-1,MEM_BACKUP_WIDTH))
in_buf := Cat(io.narrow.resp.bits, in_buf((rbits+w-1)/w*w-1,w))
}
io.wide.resp.valid := resp_val
@ -88,22 +88,24 @@ class MemSerdes extends Component
io.wide.resp.bits.data := in_buf >> UFix(io.wide.resp.bits.tag.width)
}
class MemDessert extends Component // test rig side
{
val io = new Bundle {
val narrow = new ioMemSerialized().flip
class MemDesserIO(w: Int) extends Bundle {
val narrow = new ioMemSerialized(w).flip
val wide = new ioMem
}
}
class MemDesser(w: Int) extends Component // test rig side
{
val io = new MemDesserIO(w)
val abits = io.wide.req_cmd.bits.toBits.getWidth
val dbits = io.wide.req_data.bits.toBits.getWidth
val rbits = io.wide.resp.bits.getWidth
require(dbits >= abits && rbits >= dbits)
val recv_cnt = Reg(resetVal = UFix(0, log2Up((rbits+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH)))
val recv_cnt = Reg(resetVal = UFix(0, log2Up((rbits+w-1)/w)))
val data_recv_cnt = Reg(resetVal = UFix(0, log2Up(REFILL_CYCLES)))
val adone = io.narrow.req.valid && recv_cnt === UFix((abits-1)/MEM_BACKUP_WIDTH)
val ddone = io.narrow.req.valid && recv_cnt === UFix((dbits-1)/MEM_BACKUP_WIDTH)
val rdone = io.narrow.resp.valid && recv_cnt === UFix((rbits-1)/MEM_BACKUP_WIDTH)
val adone = io.narrow.req.valid && recv_cnt === UFix((abits-1)/w)
val ddone = io.narrow.req.valid && recv_cnt === UFix((dbits-1)/w)
val rdone = io.narrow.resp.valid && recv_cnt === UFix((rbits-1)/w)
val s_cmd_recv :: s_cmd :: s_data_recv :: s_data :: s_reply :: Nil = Enum(5) { UFix() }
val state = Reg(resetVal = s_cmd_recv)
@ -111,7 +113,7 @@ class MemDessert extends Component // test rig side
val in_buf = Reg() { Bits() }
when (io.narrow.req.valid && io.narrow.req.ready || io.narrow.resp.valid) {
recv_cnt := recv_cnt + UFix(1)
in_buf := Cat(io.narrow.req.bits, in_buf((rbits+MEM_BACKUP_WIDTH-1)/MEM_BACKUP_WIDTH*MEM_BACKUP_WIDTH-1,MEM_BACKUP_WIDTH))
in_buf := Cat(io.narrow.req.bits, in_buf((rbits+w-1)/w*w-1,w))
}
io.narrow.req.ready := state === s_cmd_recv || state === s_data_recv
@ -141,17 +143,17 @@ class MemDessert extends Component // test rig side
data_recv_cnt := data_recv_cnt + UFix(1)
}
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)
val req_cmd = in_buf >> UFix(((rbits+w-1)/w - (abits+w-1)/w)*w)
io.wide.req_cmd.valid := state === s_cmd
io.wide.req_cmd.bits := io.wide.req_cmd.bits.fromBits(req_cmd)
io.wide.req_data.valid := state === s_data
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)
io.wide.req_data.bits.data := in_buf >> UFix(((rbits+w-1)/w - (dbits+w-1)/w)*w)
val dataq = (new Queue(REFILL_CYCLES)) { new MemResp }
dataq.io.enq <> io.wide.resp
dataq.io.deq.ready := recv_cnt === UFix((rbits-1)/MEM_BACKUP_WIDTH)
dataq.io.deq.ready := recv_cnt === UFix((rbits-1)/w)
io.narrow.resp.valid := dataq.io.deq.valid
io.narrow.resp.bits := dataq.io.deq.bits.toBits >> (recv_cnt * UFix(MEM_BACKUP_WIDTH))
io.narrow.resp.bits := dataq.io.deq.bits.toBits >> (recv_cnt * UFix(w))
}