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Statically report error correction/detection capability from ECC codes

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This commit is contained in:
Andrew Waterman 2017-09-15 18:44:55 -07:00
parent acea94bcef
commit 9a175b0fb1
1 changed files with 15 additions and 0 deletions
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15
src/main/scala/util/ECC.scala
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@ -15,6 +15,9 @@ abstract class Decoding
abstract class Code abstract class Code
{ {
def canDetect: Boolean
def canCorrect: Boolean
def width(w0: Int): Int def width(w0: Int): Int
def encode(x: UInt): UInt def encode(x: UInt): UInt
def decode(x: UInt): Decoding def decode(x: UInt): Decoding
@ -29,6 +32,9 @@ abstract class Code
class IdentityCode extends Code class IdentityCode extends Code
{ {
def canDetect = false
def canCorrect = false
def width(w0: Int) = w0 def width(w0: Int) = w0
def encode(x: UInt) = x def encode(x: UInt) = x
def swizzle(x: UInt) = x def swizzle(x: UInt) = x
@ -42,6 +48,9 @@ class IdentityCode extends Code
class ParityCode extends Code class ParityCode extends Code
{ {
def canDetect = true
def canCorrect = false
def width(w0: Int) = w0+1 def width(w0: Int) = w0+1
def encode(x: UInt) = Cat(x.xorR, x) def encode(x: UInt) = Cat(x.xorR, x)
def swizzle(x: UInt) = Cat(false.B, x) def swizzle(x: UInt) = Cat(false.B, x)
@ -55,6 +64,9 @@ class ParityCode extends Code
class SECCode extends Code class SECCode extends Code
{ {
def canDetect = true
def canCorrect = true
def width(k: Int) = { def width(k: Int) = {
val m = log2Floor(k) + 1 val m = log2Floor(k) + 1
k + m + (if((1 << m) < m+k+1) 1 else 0) k + m + (if((1 << m) < m+k+1) 1 else 0)
@ -101,6 +113,9 @@ class SECCode extends Code
class SECDEDCode extends Code class SECDEDCode extends Code
{ {
def canDetect = true
def canCorrect = true
private val sec = new SECCode private val sec = new SECCode
private val par = new ParityCode private val par = new ParityCode