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PDF HT6576A Data sheet ( Hoja de datos )
| Número de pieza | HT6576A | |
| Descripción | Advanced SCSI CHIP | |
| Fabricantes | Holtek Semiconductor Inc | |
| Logotipo |  |
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HT6576A
Advanced SCSI CHIP
Features
• Support the ANSI X3.131-1986 standard
• Asynchronous transfer rate to 5 Mbyte/sec
• Support initiator and target mode
• 0.8um CMOS process
Block Diagram
• On chip 48mA single-ended drivers and
receivers
• Non internal clock needed
• 44pins PLCC package
1 14th July ’97
1 page  
HT6576A
• BIT 4: ENABLE PARITY INTERRUPT
When set, this bit causes the IRQ signal to be asserted if a parity error is detected.
• BIT 3: ENABLE EOP INTERRUPT
When set, this bit causes the IRQ signal to be asserted if EOP is received from the DMA controller.
• BIT 2: MONITOR BUSY
When set, this bit causes the IRQ signa asserted when BSY changes to the inactive state for at
least a bus settle delay.
• BIT 1: DMA MODE
• BIT 0: Arbitrate
When set, this bit starts the arbitration process.
Address 3: Target command register
7 654
LAST BYTE
X
X
X
3
ASSERT
REQ
2
ASSERT
MSG
1
ASSERT
C/D
0
ASSERT
I/O
R
R/W
R/W R/W
R/W
• BIT 7: LAST BYTE SEND (READ ONLY)
• BIT 3: ASSERT REQ
WHEN SET, THE REQ SIGNAL IS ASSERTED ON THE SCSI BUS (IN TARGET MODE)
• BIT 2: ASSERT MSG
WHEN SET, THE MSG SIGNAL IS ASSERTED ON THE SCSI BUS (IN TARGET MODE)
• BIT 1: ASSERT C/D
WHEN SET, THE C/D SIGNAL IS ASSERTED ON THE SCSI BUS (IN TARGET MODE)
• BIT 0: ASSERT I/O
WHEN SET, THE I/O SIGNAL IS ASSERTED ON THE SCSI BUS (IN TAGRTE MODE)
Address 4: Current SCSI Bus Register
READ
7 65 4 3 21 0
RST
BSY
REQ
MSG
C/D
I/O
SEL
DBP
WRITE
7
SID7
–SELECT ENABLE REGISTER
65
4
SID6
SID5
SID4
3
SID3
2
SID2
1
SID1
0
SID0
5 14th July ’97
5 Page 
Initiator Receive
HT6576A
Name
t1
t2
t3
t4
t5
t6
t7
t8
t9
t10
Description
IOR inactive to next REQ active
REQ active to ACK active
IOR inactive to ACK inactive
ACK inactive time
Data Bus hold time from IOR inactive
Data Bus valid time from IOR active
REQ active to DRQ active
DACK active to DRQ inactive
DACK inactive to next DRQ active
EOP active time
11
Min.
50
50
10
50
10
—
—
—
20
30
Max.
—
—
—
—
—
20
25
20
—
—
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
14th July ’97
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet HT6576A.PDF ] | |
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