UPD98402A Datasheet, PDF (8/26 Pages) NEC – LOCAL ATM SONET FRAMER

µPD98402A
1. PIN FUNCTIONS
• PMD Interface
Symbol
RDIC
Pin No.
66
RDIT
65
RCIC
63
RCIT
62
TDOC
59
TDOT
58
TCOC
54
TCOT
53
TFKC
50
TFKT
49
I/O
I/O Level
Function
I
Pseudo ECL
These pins are used to input receive serial data when serial
Complement (–) interface mode is used (PSEL pin input = low level). Ground
I
Pseudo ECL
them when Parallel interface mode is used.
True (+)
I
Pseudo ECL
These pins are used to input the receive system clock when
Complement (–) serial interface mode is used (PSEL pin input = low level).
I
Pseudo ECL
True (+)
Clocks are input in synchronization with receive data. Ground
them when parallel interface mode is used.
O
Pseudo ECL
These pins are used to output transmit serial data when serial
Complement (–) interface mode is used (PSEL pin input = low level). They are
O
Pseudo ECL
True (+)
open-drain pins. Terminate them with VDD –2 V via a 50 Ω
resistor. To be undefined after reset.
O
Pseudo ECL
These pins are used to output transmit clocks when serial
Complement (–) interface mode is used (PSEL pin input = low level). Transmit
clocks to be input to the TFKC/TFKT pins are output passing
O
Pseudo ECL
True (+)
through internal gates. They are open-drain pins. Terminate
them with VDD –2 via a 50 Ω resistor. To be undefined after
reset.
I
Pseudo ECL
These pins are used to input transmit system clocks when
Complement (–) serial interface mode is used (PSEL pin input = low level).
Transmit data output from the TDOC/TDOT pins is output in
I
Pseudo ECL
True (+)
synchronization with clocks that are input to these pins.
Ground them when parallel interface mode is used.
RPD0-RPD7 77-73, 71-69
I
TTL
RPC
67
I
TTL
TPD0-TPD7 35-39, 43-45
O
CMOS
TPC
46
O
CMOS
TFC
48
I
TTL
PSEL
78
I
CMOS
These pins are used to input receive parallel data when
parallel interface mode is used (PSEL pin input = high level).
Leave them open when serial interface mode is used.
This pin is used to input the receive system clock when
parallel interface mode is used (PSEL pin input = high level).
Input clocks synchronous with the receive data. Leave it open
when serial interface mode is used.
These pins are used to output transmit parallel data when
parallel interface mode is used (PSEL pin input = high level).
Leave them open when serial interface mode is used.
This pin is used to output transmit clocks when parallel
interface mode is used (PSEL pin input = high level). Transmit
clocks to be input to the TFC pin are output passing through
internal gates. Leave it open when serial interface mode is
used.
This pins is used to input transmit system clocks when parallel
interface mode is used (PSEL pin input = high level). Transmit
data output from pins TPD0 to TPD7 are output in
synchronization with the clocks input to this pin. Leave it open
when serial interface mode is used.
This pin is used to select the mode for PMD interface serial/
parallel interface.
Low level: Serial interface mode
High level: Parallel interface mode
8