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參數(shù)資料
| 型號： | UPD98404GJ-KEU |
| 廠商： | NEC Corp. |
| 英文描述： | E Core |
| 中文描述： | 高級自動柜員機的SONET成幀器 |
| 文件頁數(shù)： | 13/36頁 |
| 文件大小： | 201K |
| 代理商： | UPD98404GJ-KEU |
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Data Sheet S11822EJ4V0DS00
13
μ
PD98404
1.3
Management interface
(1/2)
Pin name
Pin No.
I/O level
I/O
Function
MSEL
77
TTL*
I
Mode select signal input. The level of input to this pin determines the
management interface mode.
MSEL = 1:
Pin functions RD_B, WR_B, and RDY_B are
selected.
MSEL = 0:
Pin functions DS_B, R/W_B, and ACK_B are
selected.
MADD0-
MADD6
78-84
TTL*
I
Address input.
These pins form an address bus to input the address of an internal
register of the
μ
PD98404.
MD0-MD7
87-94
TTL*
I/O
(3-
state)
8-bit data bus.
These pins form a data bus to read or write data of an internal register
of the
μ
PD98404.
CS_B
96
TTL*
I
Chip select signal input. When the signal is low, access to an internal
register is enabled.
DS_B/
RD_B
97
TTL*
I
Data strobe signal input or read signal input. This pin functions as
either DS_B or RD_B, depending on the mode selected by the MSEL
pin.
MSEL = 0: This pin functions as DS_B to input the data
strobe signal.
MSEL = 1: This pin functions as RD_B to select read access.
R/W_B/
WR_B
98
TTL*
I
Read/write signal input or write signal input. This pin functions as
either R/W_B or WR_B, depending on the mode selected by the
MSEL pin.
MSEL = 0: This pin functions as R/W_B that inputs the
read/write control signal.
High: Read cycle
Low: Write cycle
MSEL = 1: This pin functions as WR_B that selects write access.
ACK_B/
RDY_B
99
TTL*
O
(3-
state)
Data acknowledge signal output or ready signal output. This pin
functions as either ACK_B or RDY_B, depending on the mode
selected by the MSEL pin.
MSEL = 0 : The pin functions as ACK_B that outputs the data
strobe signal.
MSEL = 1 : The pin functions as RDY_B that selects read access.
PHINT_B
100
TTL*
O
Interrupt signal output.
This pin notifies the host that an internal interrupt source has been
detected. The pin is active low.
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