Motorola MSC8101 ADS User's Guide Page 274

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Programming Reference
A-20 MSC8101 User’s Guide
PSCMR/2
00 Reserved011102113
WRC0
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
RFRC2
BL
BSMA1 BSMA2 RFRC0
0123456789101112131415
PBI OP1 OP2
SDAM0 SDAM1 SDAM2 RFRC1
SDA102SDA100
BSMA0
OP0RFEN
SDA101 PRETO-
MEMORY CONTROLLER
PSDMR
(page 2 of 2)
60x Bus SDRAM Mode Register
Address: 0x10190
Reset: 0
Read/Write
EAMUX
BUFCMD
CL0 CL1
PRETO- PRETO-
ACT0 ACT1 ACT2
ACTTO- ACTTO- ACTTO-
RW0 RW1 RW2
LDOTO-LDOTO-
PRE0PRE1
WRC1
CL[0–1] – CAS Latency
, Bits 30–31
1 All control lines except CS are asserted for 2 cycles
0 Normal timing for control lines
BUFCMD – Command Buffer, Bit 29
1 Memory controller asserts SDAMUX for an extra cycle
0 No external address multiplexing. Fastest timing
EAMUX – External Address Multiplexing Enable/Disable, Bit 28
01 1 cycle 10 2 cycles 11 3 cycles 00 4 cycles
WRC[0–1] – Write Recovery Time
, Bits 26–27
00 0 cycles 01 -1 cycle 10 -2 cycles 11
Reserved
LDOTOPRE[0–1] – Last Data Out to Precharge
, Bits 24–25
0 SDRAM burst length is 4
BL – Burst Length
, Bit 23
1 SDRAM burst length is 8
001 1 clock cycle
ACTTORW[0–2] – Activate to Read/Write Interval
, Bits 20–22
010 2 clock cycles
• • • •
111 7 clock cycles 000 8 clock cycles
000 Reserved
RFRC[02] – Refresh Recovery
, Bits 14–16
100 6 clock cycles
010 4 clock cycles 110 8 clock cycles
001 3 clock cycles 101 7 clock cycles
011 5 clock cycles 111 16 clock cycles
001 1 clock-cycle wait states
PRETOACT[0–2] – Precharge to Activate Interval
, Bits 17–19
• • • •
010 2 clock-cycle wait states
111 7 clock-cycle wait states 000 8 clock-cycle wait states
See Sheet 1 – Memory Controller – PSDMR
before issuing an ACTIVATE command to the SDRAM
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