FUJITSU MB91460 SERIES FR60 User Manual
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Chapter 31 External Bus
2.External Bus Interface Registers
lists the settings for burst write.
For connecting FCRAM, be sure to set the bit to 1.
FCRAM supports neither burst read nor single write mode.
[BIt 26] BANK (BANK type select): Bank number setting
Set this bit to the number of banks of SDRAM to be connected.
lists the settings for bank number.
[Bits 25 - 24] ABS1, ABS0 (Active Bank Select): Setting of active bank number
Set these bits to the maximum number of banks to be made active simultaneously.
lists the settings for the number of active banks.
2.5 Memory setting register (MCRB for FCRAM auto - precharge ON mode)
This section describes the memory setting register (MCRB for FCRAM auto - precharge ON
mode).
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Structure of the Memory Setting Register (MCRB for FCRAM auto - precharge ON mode)
Settings for Memory configuration register (MCRB: Memory Configuration Register for extend type - B for FCRAM
auto - precharge ON mode) is used to make various settings for FCRAM connected to the chip select area.
shows the bit configuration of the memory setting register (MCRB for FCRAM auto - precharge ON
mode).
Table 2-18 Settings for burst write
WBST
Settings for burst write
0
Single write
1
Burst write
Table 2-19 settings for bank number
BANK
Settings for bank number
0
2 banks
1
4 banks
Table 2-20 Settings for the number of active banks
ABS1
ABS0
Number of active banks
0
0
1 bank
0
1
2 banks
1
0
3 banks
1
1
4 banks