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-rw-r--r--util/spd_tools/ddr4/README.md6
-rw-r--r--util/spd_tools/ddr4/gen_spd.go40
-rw-r--r--util/spd_tools/ddr4/global_ddr4_mem_parts.json.txt6
3 files changed, 35 insertions, 17 deletions
diff --git a/util/spd_tools/ddr4/README.md b/util/spd_tools/ddr4/README.md
index 646d937d9b..75275441a2 100644
--- a/util/spd_tools/ddr4/README.md
+++ b/util/spd_tools/ddr4/README.md
@@ -59,7 +59,7 @@ Input JSON file requires the following two fields for every memory part:
* `diesPerPackage`: Number of dies on the part. Valid values:
`1, 2` dies per package.
-* `deviceBusWidth`: Number of bits of the device's address bus. Valid values:
+* `packageBusWidth`: Number of bits of the device's address bus. Valid values:
`8, 16` bit-wide bus. NOTE: Width of x4 is not supported by this tool.
* `ranksPerPackage`: From Jedec doc 4_01_02_AnnexL-1R23:
@@ -145,7 +145,7 @@ string like "9 10 11 12 14".
"CL_nRCD_nRP": 22
"capacityPerDieGb": 8,
"diesPerPackage": 2,
- "deviceBusWidth": 16,
+ "packageBusWidth": 16,
"ranksPerPackage": 1,
}
},
@@ -156,7 +156,7 @@ string like "9 10 11 12 14".
"CL_nRCD_nRP": 22
"capacityPerDieGb": 8,
"diesPerPackage": 1,
- "deviceBusWidth": 16,
+ "packageBusWidth": 16,
"ranksPerPackage": 2,
"casLatencies": "9 10 11 12 13 14 15 16 17 18 19 20",
"tCKMaxPs": "1250"
diff --git a/util/spd_tools/ddr4/gen_spd.go b/util/spd_tools/ddr4/gen_spd.go
index e3fa732179..3c8f71a263 100644
--- a/util/spd_tools/ddr4/gen_spd.go
+++ b/util/spd_tools/ddr4/gen_spd.go
@@ -47,7 +47,7 @@ type memAttributes struct {
CL_nRCD_nRP int
CapacityPerDieGb int
DiesPerPackage int
- DeviceBusWidth int
+ PackageBusWidth int
RanksPerPackage int
/*
@@ -79,6 +79,9 @@ type memAttributes struct {
CASSecondByte byte
CASThirdByte byte
CASFourthByte byte
+
+ /* The following is for internal-use only and is not overridable */
+ dieBusWidth int
}
/* This encodes the density in Gb to SPD low nibble value as per JESD 4.1.2.L-5 R29 */
@@ -179,7 +182,7 @@ var speedBinToSPDEncoding = map[int]speedBinAttributes {
func getBankGroups(memAttribs *memAttributes) byte {
var bg byte
- switch memAttribs.DeviceBusWidth {
+ switch memAttribs.PackageBusWidth {
case 8:
bg = 4
case 16:
@@ -296,7 +299,7 @@ func encodeRanks(ranks int) byte {
func encodeModuleOrganization(memAttribs *memAttributes) byte {
var b byte
- b = encodeDataWidth(memAttribs.DeviceBusWidth)
+ b = encodeDataWidth(memAttribs.dieBusWidth)
b |= encodeRanks(memAttribs.RanksPerPackage)
return b
@@ -390,20 +393,21 @@ func encodeTRCMinLsb(memAttribs *memAttributes) byte {
return byte(convPsToMtb(memAttribs.TRCMinPs) & 0xff)
}
+/* This takes memAttribs.PackageBusWidth as an index */
var pageSizefromBusWidthEncoding = map[int]int {
8: 1,
16: 2,
}
/*
- * Per Table 69 & Table 70 of Jedec JESD79-4C
+ * Per Table 169 & Table 170 of Jedec JESD79-4C
* tFAW timing is based on :
* Speed bin and page size
*/
func getTFAWMinPs(memAttribs *memAttributes) int {
var tFAWFixed int
- if pageSizefromBusWidthEncoding[memAttribs.DeviceBusWidth] == 1 {
+ if pageSizefromBusWidthEncoding[memAttribs.PackageBusWidth] == 1 {
switch memAttribs.SpeedMTps {
case 1600:
tFAWFixed = 25000
@@ -412,7 +416,7 @@ func getTFAWMinPs(memAttribs *memAttributes) int {
default:
tFAWFixed = 21000
}
- } else if pageSizefromBusWidthEncoding[memAttribs.DeviceBusWidth] == 2 {
+ } else if pageSizefromBusWidthEncoding[memAttribs.PackageBusWidth] == 2 {
switch memAttribs.SpeedMTps {
case 1600:
tFAWFixed = 35000
@@ -433,7 +437,7 @@ func updateTFAWMin(memAttribs *memAttributes) {
memAttribs.TFAWMinPs = getTFAWMinPs(memAttribs)
}
- switch pageSizefromBusWidthEncoding[memAttribs.DeviceBusWidth] {
+ switch pageSizefromBusWidthEncoding[memAttribs.PackageBusWidth] {
case 1:
tFAWFromTck = 20 * memAttribs.TCKMinPs
case 2:
@@ -470,7 +474,7 @@ func getTRRDLMinPs(memAttribs *memAttributes) int {
* Per JESD79-4C Tables 169 & 170, tRRD_L is based on :
* Speed bin and page size
*/
- switch pageSizefromBusWidthEncoding[memAttribs.DeviceBusWidth] {
+ switch pageSizefromBusWidthEncoding[memAttribs.PackageBusWidth] {
case 1:
switch memAttribs.SpeedMTps {
case 1600:
@@ -527,7 +531,7 @@ var speedToTRRDSMinPsTwoKPageSize = map[int]int {
func getTRRDSMinPs(memAttribs *memAttributes) int {
var tRRDFixed int
- switch pageSizefromBusWidthEncoding[memAttribs.DeviceBusWidth] {
+ switch pageSizefromBusWidthEncoding[memAttribs.PackageBusWidth] {
case 1:
tRRDFixed = speedToTRRDSMinPsOneKPageSize[memAttribs.SpeedMTps]
case 2:
@@ -1041,7 +1045,7 @@ func validateDiesPerPackage(dieCount int) error {
return fmt.Errorf("Incorrect dies per package count: ", dieCount)
}
-func validateDeviceBusWidth(width int) error {
+func validatePackageBusWidth(width int) error {
if width != 8 && width != 16 {
return fmt.Errorf("Incorrect device bus width: ", width)
}
@@ -1095,7 +1099,7 @@ func validateMemoryParts(memParts *memParts) error {
if err := validateDiesPerPackage(memParts.MemParts[i].Attribs.DiesPerPackage); err != nil {
return err
}
- if err := validateDeviceBusWidth(memParts.MemParts[i].Attribs.DeviceBusWidth); err != nil {
+ if err := validatePackageBusWidth(memParts.MemParts[i].Attribs.PackageBusWidth); err != nil {
return err
}
if err := validateRanksPerPackage(memParts.MemParts[i].Attribs.RanksPerPackage); err != nil {
@@ -1254,6 +1258,19 @@ func getDefaultCASLatencies(memAttribs *memAttributes) string {
return str
}
+func updateDieBusWidth(memAttribs *memAttributes) {
+ if memAttribs.PackageBusWidth == 16 && memAttribs.RanksPerPackage == 1 &&
+ memAttribs.DiesPerPackage == 2 {
+ /*
+ * If a x16 part has 2 die with single rank, PackageBusWidth
+ * needs to be converted to match die bus width.
+ */
+ memAttribs.dieBusWidth = 8
+ } else {
+ memAttribs.dieBusWidth = memAttribs.PackageBusWidth
+ }
+}
+
func updateCAS(memAttribs *memAttributes) error {
if len(memAttribs.CASLatencies) == 0 {
memAttribs.CASLatencies = getDefaultCASLatencies(memAttribs)
@@ -1335,6 +1352,7 @@ func updateTWTRMin(memAttribs *memAttributes) {
}
func updateMemoryAttributes(memAttribs *memAttributes) {
+ updateDieBusWidth(memAttribs)
updateTCK(memAttribs)
updateTAAMin(memAttribs)
updateTRCDMin(memAttribs)
diff --git a/util/spd_tools/ddr4/global_ddr4_mem_parts.json.txt b/util/spd_tools/ddr4/global_ddr4_mem_parts.json.txt
index 51068d5154..b2acf9ea82 100644
--- a/util/spd_tools/ddr4/global_ddr4_mem_parts.json.txt
+++ b/util/spd_tools/ddr4/global_ddr4_mem_parts.json.txt
@@ -10,7 +10,7 @@
"CL_nRCD_nRP": 22,
"capacityPerDieGb": 8,
"diesPerPackage": 1,
- "deviceBusWidth": 16,
+ "packageBusWidth": 16,
"ranksPerPackage": 1
}
},
@@ -21,7 +21,7 @@
"CL_nRCD_nRP": 22,
"capacityPerDieGb": 8,
"diesPerPackage": 1,
- "deviceBusWidth": 16,
+ "packageBusWidth": 16,
"ranksPerPackage": 1
}
},
@@ -32,7 +32,7 @@
"CL_nRCD_nRP": 22,
"capacityPerDieGb": 8,
"diesPerPackage": 2,
- "deviceBusWidth": 16,
+ "packageBusWidth": 16,
"ranksPerPackage": 1
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 04:56:23 +0000