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參數(shù)資料
| 型號： | Z53C80SCSI |
| 廠商： | ZiLOG, Inc. |
| 英文描述： | SMALL COMPUTER SYSTEM INTERFACE (SCSI) |
| 中文描述： | 小型計算機系統(tǒng)接口（SCSI） |
| 文件頁數(shù)： | 6/40頁 |
| 文件大?。?/td> | 447K |
| 代理商： | Z53C80SCSI |
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6
Z53C80 SCSI
PS97SCC0200
Z
ILOG
SCSI BUS
The following signals are all Bi-directional, active Low,
open-drain, with 48 mA sink capacity. All pins interface
directly with the SCSI Bus.
/ACK
/Acknowledge (Bi-directional, Open-Drain, Active
Low). /ACK is driven by the Initiator and indicates an
acknowledgment for a SCSI data transfer. /ACK is received
as a response to the /REQ Signal in the Target role.
/ATN
/Attention (Bi-directional, Open-Drain, Active Low).
/ATN is driven by the Initiator and indicates an attention
condition. /ATN is received and is responded to by entering
the Message Out Phase in the Target role.
/BSY
/Busy Bi-directional, Open-Drain, Active Low). /BSY
indicates that the SCSI Bus is being occupied. /BSY can be
driven by both the Target and the Initiator device.
/C//D
/Control//Data (Bi-directional, Open-Drain, Active
Low). C//D indicates Control or Data information is on the
SCSI Bus. This signal is driven by a Target and is received
by the Initiator.
/I//O
/Input//Output Bi-directional, Open-Drain, Active Low)
/I//O is driven by a Target and controls the direction of data
transfer on the SCSI Bus. When asserted, this signal
indicates input to the Initiator. When not asserted, this
signal indicates output from the Initiator. This signal is also
used to recognize the difference between the Selection
and Reselection Phases.
/MSG
/Message Bi-directional, Open-Drain, Active Low).
The Target drives /MSG active during the Message Phase
and is received by the Initiator.
/REQ
/Request (Bi-directional, Open-Drain, Active Low).
Received by the Initiator and driven by a Target, /REQ
indicates a request for an SCSI data-transfer handshake.
/RST
SCSI Bus RESET Bi-directional, Open-Drain, Active
Low). The /RST signal shows a SCSI Bus RESET condition
has occurred.
/DB7-/DB0,/DBP
/Data Bits, /Parity Bits (Bi-directional,
Open-Drain, Active Low). These eight data bits (/DB7-/
DB0), plus a parity bit (/DBP) form the SCSI Data Bus. /DB7
has the highest priority during the Arbitration phase and is
the most significant bit (MSB). Data parity is odd and is
always generated and optionally checked, which is not
valid during Arbitration.
/SEL
/Select (Bi-directional, Open-Drain, Active Low).
/SEL is used by a Target to select an Initiator, or by an
Initiator to reselect a Target.
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