參數(shù)資料
型號(hào): 82596DX
廠商: Intel Corp.
英文描述: HIGH-PERFORMANCE 32-BIT LOCAL AREA NETWORK COPROCESSOR
中文描述: 高性能的32位局域網(wǎng)協(xié)處理器
文件頁(yè)數(shù): 11/77頁(yè)
文件大?。?/td> 787K
代理商: 82596DX
82596DX/SX
PIN DESCRIPTIONS
(Continued)
Symbol
PQFP
Pin No.
Type
Name and Function
W/R
120
O
WRITE/READ.
This dual-function pin is used to distinguish Write and
Read cycles. This line is floated after a Reset or when the bus is not
acquired.
ADS
124
O
ADDRESS STATUS.
This tri-state pin is used by the 82596 to indicate
that a valid bus cycle has begun and that A31–A2, BE3–BE0, and
W/R are being driven. It is asserted during t1 bus states. This line is
floated after a Reset or when the bus is not acquired.
RDY
130
I
READY.
Active low. This signal is the acknowledgment from
addressed memory that the transfer cycle can be completed. When
high, it causes wait states to be inserted. It is ignored at the end of the
first clock of the bus cycle’s data cycle. This active-low signal does not
have an internal pull-up resistor. This signal must meet the setup and
hold times to operate correctly.
LOCK
126
O
LOCK.
This tri-state pin is used to distinguish locked and unlocked bus
cycles. LOCK generates a semaphore handshake to the CPU. LOCK
can be active for several memory cycles, it goes active during the first
locked memory cycle (t1) and goes inactive at the last locked cycle
(t2). This line is floated after a Reset or when the bus is not acquired.
LOCK can be disabled via the sysbus byte in software.
BS16
129
I
BUS SIZE.
This signal allows the 82596DX to work with either 16- or
32-bit bytes. This signal is static and should be tied high for 32-bit
operation or low for 16-bit operation. In Little Endian mode the D0–
D15 lines are driven when BS16 is inserted, in Big Endian mode the
D16–D31 lines are driven.
HOLD
123
O
HOLD.
The HOLD signal is active high, the 82596 uses it to request
local bus mastership. In normal operation HOLD goes inactive before
HLDA. The 82596 can be forced off the bus by deasserting HLDA or if
the bus throttle timers expire.
HLDA
118
I
HOLD ACKNOWLEDGE.
The HLDA signal is active high, it indicates
that bus mastership has been given to the 82596. HLDA is internally
synchronized; after HOLD is detected low, the CPU drives HLDA low.
NOTE
Do not connect HLDA to V
CC
Dit will cause a deadlock. A user wanting
to give the 82596 permanent access to the bus should connect HLDA
to HOLD. If HLDA goes inactive before HOLD, the 82596 will release
the bus (by deasserting HOLD) within a specified number of system
clocks.
BREQ
115
I
BUS REQUEST.
This signal, when configured to an externally
activated mode, is used to trigger the bus throttle timers.
11
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