參數(shù)資料
型號(hào): SAA7382GP
廠商: NXP SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: Error correction and host interface IC for CD-ROM ELM
中文描述: SPECIALTY MICROPROCESSOR CIRCUIT, PQFP80
封裝: PLASTIC, QFP-80
文件頁(yè)數(shù): 27/60頁(yè)
文件大?。?/td> 226K
代理商: SAA7382GP
1996 Apr 25
27
Philips Semiconductors
Preliminary specification
Error correction and host interface IC for
CD-ROM (ELM)
SAA7382
7.9.1.3
Data Transfer
The other registers are used for data transfers. These can only occur when the sub-CPU has enabled a data transfer.
This will be indicated to the host by the DTEN pin being LOW.
7.9.2
O
AK COMPATIBILITY MODE
Table 26
Oak compatibility mode
Note
1.
Where X = don’t care.
Data transfer is selected when the transfer type is non-DMA, the sub-CPU has started a data transfer and the DTS bit in
the HCON register has not been asserted.
DMA transfer is selected using the HCON register.
The COMIN and SBOUT registers are similar to the same registers in the Sanyo compatibility mode.
7.9.2.1
RESET Sub-CPU
Writing to this register causes the SCRST pin to go LOW for several clock periods. The SAA7382 registers are not
affected.
7.9.2.2
TSTAT
Table 27
TSTAT register bits
This is the host Transfer Status Register. The EJECT bit reflects the state of the EJECT pin. Bits EOP, STEN and DTEN
have the same operation as the equivalent pins in the Sanyo compatibility mode. Bit WAIT is the same as the Sanyo
mode WAIT pin when non-DMA transfer is selected otherwise it is logic 1. Bit DRQ is the same as the Sanyo mode WAIT
pin when DMA transfer is selected otherwise it is logic 0.
DMACK
HEN
(1)
DA1
(1)
DA0
(1)
HRD
(1)
HWR
(1)
DATA TRANSFER
SELECTED
(1)
OPERATION
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
1
X
X
0
0
0
0
0
0
1
X
X
X
0
0
0
0
1
1
0
X
X
X
1
0
1
0
1
0
1
X
1
0
0
1
0
1
0
1
0
X
0
1
NO
NO
YES
YES
X
X
X
X
X
X
write COMIN
read SBOUT
write data
read data
RESET sub-CPU
read TSTAT
write HCON
none
write DMA data
read DMA data
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
1
1
EJECT
WAIT
EOP
STEN
DTEN
DRQ
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