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| MC68LC302 Datasheet, PDF (110/169 Pages) Motorola, Inc – Low Power Integrated Multiprotocol Processor Reference Manual | |||
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Signal Description
RXD1 / L1RXD
TXD1 / L1TXD
RCLK1 / L1CLK
TCLK1 / L1SY0 / SDS1
CD1 / L1SY1
CTS1 / L1GR
RTS1 / L1RQ / GCIDCL
Figure 5-9. NMSI1 or ISDN Interface Pins
These seven pins can be used either as NMSI1 in nonmultiplexed serial interface (NMSI)
mode or as an ISDN physical layer interface in IDL, GCI, and PCM highway modes. The in-
put buffers have Schmitt triggers.
Table 5-8 shows the functionality of each pin in NMSI, GCI, IDL, and PCM highway modes.
Table 5-8. Mode Pin Functions
Signal Name
RXD1/L1RXD
TXD1/L1TXD
RCLK1/L1CLK
TCLK1/L1SY0
CD1/L1SY1
CTS1/L1GR
RTS1/L1RQ
NMSI1
I
RXD1
O
TXD1
I/O
RCLK1
I/O
TCLK1
I
CD1
I
CTS1
O
RTS1
GCI
I
L1RXD
O
L1TXD
I
L1CLK
O
SDS1
I
L1SYNC
I
L1GR
O
GCIDCL
IDL
I
L1RXD
O
L1TXD
I
L1CLK
O
SDS1
I
L1SYNC
I
L1GR
O
L1RQ
PCM
I
L1RXD
O
L1TXD
I
L1CLK
I
L1SY0
I
L1SY1
O
RTS
NOTES:
1. In IDL and GCI mode, SDS2 is output on the PA7 pin.
2. CD1 may be used as an external sync in NMSI mode.
3. RTS is the RTS1, RTS2, or RTS3 pin according to which SCCs are connected to the PCM highway.
RXD1/L1RXDâReceive Data/Layer-1 Receive Data
This input is used as the NMSI1 receive data in NMSI mode and as the receive data input
in IDL, GCI, and PCM modes.
TXD1/L1TXDâTransmit Data/Layer-1 Transmit Data
This output is used as NMSI1 transmit data in NMSI mode and as the transmit data output
in IDL, GCI, and PCM modes. TXD1 may be configured as an open-drain output in NMSI
mode. L1TXD in IDL and PCM mode is a three-state output. In GCI mode, it is an open-
drain output.
MOTOROLA
MC68LC302 REFERENCE MANUAL
5-15
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