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參數資料
型號: W88227QD
廠商: WINBOND ELECTRONICS CORP
元件分類: 消費家電
英文描述: ATAPI CD-ROM Decoder(支持ATAPI標準的CD-ROM解碼器)
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP128
封裝: LQFP-128
文件頁數: 66/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 62 -
1999/10/1 Rev: 0.70
RAMCF - RAM Configuration Register - (read/write 2Ah)
This register is 0 after chip reset.
Bit 7:
RFTYP - Refresh Type
The refresh mode of DRAM is CAS-before-RAS if this bit is high. The refresh mode of DRAM is
RAS-only if this bit is low.
Bit 6:
RFTRG - RAM Filling Trigger
Setting this bit high triggers the DRAM filling. All locations in the external RAM will be filled with
the value in register
RAMWR (1Eh,w)
. The value (ex:00h) should be written to registers RACL,
RACU, and RACH before triggering RFTRG. Flag
RFC (2Ah.r5)
will change from 0 to
when all RAM locations have been filled. After RAM Filling has completed, the microprocessor
should clear RFTRG to 0.
1
Bit 5:
RFC - RAM Fill Completion Flag (read only)
This flag will change from 0 to 1 when all RAM locations have been filled with the value in register
RAMWR (1Eh,w)
. This flag is clear when RFTRG is disabled.
Reserved (write only)
SWAP - Host High-Low Swap
Bit 5:
Bit 4:
Setting this bit high causes the host access of high/low byte to be swapped.
Bit 3:
TWES - Two WE/CAS Select
If this bit is low, pin CASH/nRWEH is used as Column Address Strobe for high byte. If this bit is
high, pin CASH/nRWEH is used as Write Enable Strobe for high byte..
Bit 2-0: RTC[2:0] - External RAM Type Configuration Bits
The external RAM should be appropriately configured by these three bits according to its specification.
RTC[2:0] are de-activated by master reset, but are not changed by firmware reset.
RTC[2:0]
RAM Configuration
0,1, 4, 7
Reserved
2
256K x 4-bit x 2, 256K x 8-bit x 1,
128K x 8-bit x 1, 8-Row 9-Column
3
128K x 8-bit x 1, 9-Row 8-Column
4
64K x 16-bit x 1, (8-row 8-Column)
128K x 16-bit x 1 (9-Row 8-Column)
128K x 8-bit x 2 (9-Row 8-Column)
5
256K x 16-bit x 1
128K x 16-bit x 1 (8-Row 9-Column)
128K x 8-bit x 2, (8-Row 9-Column)
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