Specifications

Rev. 1.43
User's Guide
49
Typical Option Register:
Bit Field Value Function
0-16 AM $FE00 0 Address mask: for 32 MBytes
17-18 BPD 01 Bank per device: 4
19-22 ROWST 0111 Row start address bit: A7
23-25 NUMR 011 Number of Row lines: 12
26 PMSEL 0 Page mode select: normal
27 IBID 0 Int. bank interleaving: enable
28-31 Reserved 0000 ---
-> OR1 = $FE00 2EC0
For 32 MB version
-> OR1 = $F800 2B00
For 128 MB version
Typical 60x SDRAM Mode Register:
Bit Field Value Function
0 PBI 1 Page based interleaving: yes
1 RFEN 1 Refresh enable: yes
2-4 OP 000 SDRAM operation: normal
5-7 SDAM 010 Address mux size: MPCA18 -> (SDA28)
8-10 BSMA 010 Bank select address lines: not used
11-13 A10 010 A10 control: A8
14-16 RFRC 100 Refresh recovery: 4 clocks
17-19 PRETOACT 010 Precharge to activate interval: 2 clocks
20-22 ACTTORW 010 Activate to Read/Write interval: 2 clocks
23 BL 0 Burst length: for 64 bits
24-25 LDOTOPRE 01 Last data out to precharge: -1 clock
26-27 WRC 10 Write recovery time: 2 clock
28 EAMUX 0 External address multiplexing: disabled
29 BUFCMD 0 External buffers: no
30-31 CL 10 CAS latency: 2
-> PSDMR = $C24A 2462 For 32 MB version
-> PSDMR = $C32E 2462
For 128 MB version
Typical 60x bus-assigned Refresh Timer Register:
Bit Field Value Function
0-7 PSRT 00111110 Refresh timer period
-> PSRT = $1F
Typical Memory Periodic Timer Pre-scaler Register:
Bit Field Value Function
0-7 PTP 00100000 Refresh timers prescaler
8-15 Reserved 00000000 ---
-> MPTPR = $2000
These settings configure the refresh period to 15.5 µs.
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