Intel G645 BX80623G645 用户手册
产品代码
BX80623G645
Processor Configuration Registers
206
Datasheet, Volume 2
2.13.2
TC_RAP_C0—Timing of DDR Regular Access Parameters
Register
This register provides the regular timing parameters in DCLK cycles.
2.13.3
SC_IO_LATENCY_C0—IO Latency Configuration Register
This register identifies the I/O latency per rank, and I/O compensation (global).
B/D/F/Type
0/0/0/MCHBAR MC0
Address Offset:
4004–4007h
Reset Value:
0010_4044h
Access:
RW-L
Size:
32 bits
Bit
Attr
Reset
Value
RST/
PWR
Description
31:24
RO
0h
Reserved
23:16
RW-L
10h
Four-Activate Window
This field provides the time frame in which maximum of 4 ACT
This field provides the time frame in which maximum of 4 ACT
commands to the same rank are allowed. The minimum value is
4*tRRD; the maximum value is 63 DCLK cycles.
15:12
RW-L
4h
Delay Internal WR to RD Transaction
This field provides the delay from internal WR transaction to
This field provides the delay from internal WR transaction to
internal RD transaction. The minimum delay is 4 DCLK cycles,
whereas the maximum delay is 8 DCLK cycles.
11:8
RO
0h
Reserved
7:4
RW-L
4h
Minimum Delay From CAS-RD to PRE
The minimum delay is 4 DCLK cycles; the maximum delay is 8
The minimum delay is 4 DCLK cycles; the maximum delay is 8
DCLK cycles.
3:0
RW-L
4h
Delay Between Two Act Commands
tRRD is the minimum delay between two ACT commands targeted
tRRD is the minimum delay between two ACT commands targeted
to different banks in the same rank. The minimum delay is 4 DCLK
cycles; the maximum delay is 7 cycles.
B/D/F/Type
0/0/0/MCHBAR MC0
Address Offset:
4028–402Bh
Reset Value:
0000_0000h
Access:
RW-L
Size:
32 bits
Bit
Attr
Reset
Value
RST/
PWR
Description
31:16
RO
0h
Reserved
15:12
RW-L
0h
IO latency Rank 1 DIMM 1
11:8
RW-L
0h
IO latency Rank 0 DIMM 1
7:4
RW-L
0h
IO latency Rank 1 DIMM 0
3:0
RW-L
0h
IO latency Rank 0 DIMM 0