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參數(shù)資料
| 型號： | STP2021PLCC |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| 中文描述： | 250 的低電流運算，低反向泄露，低噪聲穩(wěn)壓二極管 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大小： | 221K |
| 代理商： | STP2021PLCC |
5
32-bit SBus Master I/O Controller
Master I/O
STP2000QFP
July 1997
1. Drives MIS input of the AT&T T7213 chip to select between twisted pair and AUI-type Ethernet interfaces, with ENET_AUI = 0 selecting
AUI.
1. All of the SCSI pads (except the crystal oscillator pads) are custom NCR 48 mA bidirectional open-drain pads with hysteresis on inputs.
Ethernet Interface
Name
Type
Description
ENET_AUI
[1]
Output
Ethernet TP/AUI select
ENET_TX
Output
Ethernet Transmit data
ENET_TENA
Output
Ethernet Transmit enable
ENET_CLSN
Input
Ethernet Collision detect
ENET_RX
Input
Ethernet Receive data
ENET_RENA
Input
Ethernet Receiver enable (carrier sense)
ENET_TCLK
Input
Ethernet Transmit clock
ENET_RCLK
Input
Ethernet Receive clock
SCSI Interface
[1]
Name
Type
Description
SCSI_D[7:0]
I/O
SCSI Data
SCSI_DP
I/O
SCSI Data Parity
SCSI_SEL
I/O
SCSI Select
SCSI_BSY
I/O
SCSI Busy
SCSI_REQ
I/O
SCSI Request
SCSI_ACK
I/O
SCSI Acknowledge
SCSI_MSG
I/O
SCSI Message
SCSI_CD
I/O
SCSI Command/Data
SCSI_IO
I/O
SCSI Input/Output
SCSI_ATN
I/O
SCSI Attention
SCSI_RST
I/O
SCSI Reset
SCSI_XTAL_IN
Input
SCSI Clock Crystal In (can drive with external CMOS clock)
SCSI_XTAL_OUT
Output
SCSI Clock Crystal Out (must not connect to any external load)
Parallel Port Interface
Name
Type
Description
P_DATA[7:0]
3-State
Parallel Port Data Bus
P_D_STRB
I/O
Parallel Port Data Strobe (25
μ
A pull-down)
Parallel Port Busy (25
μ
A pull-up)
P_BSY
I/O
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