参数资料
型号: MB86604LPFV
元件分类: 总线控制器
英文描述: SCSI BUS CONTROLLER, PQFP100
封装: PLASTIC, LQFP-100
文件页数: 16/56页
文件大小: 382K
代理商: MB86604LPFV
23
MB86604L
(5) DMA interface
The DMA access timing described in this section is not applicable in the following cases.
During SCSI input, when the data buffer is EMPTY or when one byte is stored
During SCSI output, when the data buffer is FULL or when 31 bytes are stored
When a parity error is detected (target)
When an error which pauses the transfer occurs at the SCSI interface
80 series handshake mode
(a) Write timing
* : The position number indicates the position in the waveform.
Parameter
Symbol
Value
Unit
Base signal
Position*
Min.
Max.
DACK “L” assert time
DREQ “H”
tRQAK
A0—
ns
DREQ “L” negate time
DACK “L”
tAKRQ
B
40
ns
DREQ “H” assert time (8 bit)
DACK “H”
tAKRQ1
C
50
ns
DREQ “H” assert time (16 bit)
DACK “H”
tAKRQ2
C—
2 tCLK + 40
ns
IOWR “L” assert time
DACK “L”
tAKWR
D0
ns
DMBHE, DMA0 set up time
IOWR “L”
tsuDA
E20
ns
DMBHE, DMA0 hold time
IOWR “H”
thDA
F20
ns
IOWR “L” level pulse width
twWRL
G40
ns
DACK “H” negate time
IOWR “L”
tWRAK1
H1 tCLK
—ns
IOWR “H”
tWRAK2
I0
ns
Input data set up time
IOWR “H”
tsuDMD
J30
ns
Input data hold time
IOWR “H”
thDMD
K5—
ns
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