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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: 54/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 50 -
1999/10/1 Rev: 0.70
MBTC1 - Multi-Block Transfer Control 1 - (read/write 13h)
This register is for debug only. This register is 0 after chip reset, host reset and firmware reset.
Bit 7-3: Reserved
Bit 2:
MBTIEN - Multi-Block Transfer Interrupt Enable
If
MBTIEN
and
MBTFEN
are both enabled,
Decoder interrupt
will activate at the end of data transfer
of each block if the block count in
MBC (12h.4-0)
is not zero. There is no need to set this bit in normal
operation.
Bit 1:
MBTFEN - Multi-Block Transfer Interrupt Flag Enable
If this bit is high,
MBTI (30h.r4)
will be activated at the end of data transfer of each block if the block
count in
MBC (12h.4-0)
is not zero. There is no need to set this bit in normal operation.
INCMBC - Increment Multi-Block Counter
Bit 0:
Setting this bit high increments
MBC (12h.4-0)
. This function is useful in data transfer to host by
DMA mode. Because data byte count is not specified in DMA mode transfer, the number of block
to be transferred can be incremented when a new block becomes available before the transfer is
completed.
ECTRL - Enhanced Control Register - (write 14h)
Bit 7-2: Reserved
Bit 1:
IR7F - Provide Flag UTBY at IR7
When this bit is high, flag
UTBY (1Fh.r7)
can be monitored by read bit-7 of the Index Register.
DISAI - Disable Auto-Increment of Microprocessor-RAM Address Counter
Bit 0:
When this bit is high, the automatic increment of the
RAC (2Dh/1Dh/1Ch)
address counter is disabled.
Note that DISAI should be 0 before
RFTRG (2Ah.w6)
is triggered.
SUBH0 to SUBH3 - Subheader Registers - (read 14h to 17h)
These registers are used to hold the information of subheader bytes. If
BUFEN (0Ah.w2)
is disabled, subheader
bytes are latched from incoming serial data. If
BUFEN (0Ah.w2)
is enabled, subheader bytes are retrieved from
the external RAM.
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