Intel A2Y15AV Arkusz Danych Strona 241

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Datasheet, Volume 2 241
Processor Configuration Registers
2.13.2 TC_RAP_C0—Timing of DDR – Regular Access Parameters
Register
Thie register is for the regular timing parameters in DCLK cycles.
B/D/F/Type: 0/0/0/MCHBAR MC0
Address Offset: 4004–4007h
Reset Value: 86104344h
Access: RW-L
Size: 32 bits
Bit Access
Reset
Value
RST/
PWR
Description
31:30 RW-L 10b Uncore
1n 2N or 3N selection (CMD_stretch)
This field defines the operation mode of the command.
00 = N operation
10 = 2N operation
11 = 3N operation
29 RW-L 0b Uncore
Command 3-state options (CMD_3st)
This bit defines when command & address bus is driving.
0 = Drive when channel is active. Tri-stated when all ranks are in
CKE-off or when memory is in SR or deeper.
1 = Command bus is always driving. When no new valid
command is driven, previous command & address is driven
28:24 RW-L 06h Uncore
tWR in DCLK cycles (tWR)
Write recovery time. The range is 5 to 16 DCLK cycles.
23:16 RW-L 10h Uncore
tFAW in DCLK cycles (tFAW)
Four-activate window is the time frame in which maximum of 4
ACT commands to the same rank are allowed. The minimum
value is 4*tRRD, whereas the maximum value is 63 DCLK cycles.
15:12 RW-L 4h Uncore
tWTR in DCLK cycles (tWTR)
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 RW-L 3h Uncore
tCKE in DCLK cycles (tCKE)
CKE minimum pulse width in DCLK cycles. The minimum value is
3 DCLK cycles, whereas the maximum value is the actual value of
tXP.
7:4 RW-L 4h Uncore
tRTP in DCLK cycles (tRTP)
Minimum delay from CAS-RD to PRE. The minimum delay is 4
DCLK cycles, whereas the maximum delay is 8 DCLK cycles.
3:0 RW-L 4h Uncore
tRRD in DCLK cycles (tRRD)
tRRD is the minimum delay between two ACT commands
targeted to different banks in the same rank. The minimum delay
is 4 DCLK cycles, whereas the maximum delay is 7 cycles.
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