Motorola MPC860 PowerQUICC, User Manual

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Part I. Overview
MOTOROLA Chapter 3. Hardware Interface Overview 3-13
PB[24]
SMRXD1 Bidirectional
(Optional:
Open-drain)
General-Purpose I/O Port B Bit 24ÑBit 24 of the general-purpose I/O port B.
SMRXD1ÑSMC1 receive data input.
PB[23]
SMSYN1
SDACK1 Bidirectional
(Optional:
Open-drain)
General-Purpose I/O Port B Bit 23ÑBit 23 of the general-purpose I/O port B.
SMSYN1ÑSMC1 external sync input.
SDACK1ÑSDMA acknowledge 1 output that is used as a peripheral interface signal
for IDMA emulation, or as a CAM interface signal for Ethernet.
PB[22]
SMSYN2
SDACK2 Bidirectional
(Optional:
Open-drain)
General-Purpose I/O Port B Bit 22ÑBit 22 of the general-purpose I/O port B.
SMSYN2ÑSMC2 external sync input.
SDACK2ÑSDMA acknowledge 2 output that is used as a peripheral interface signal
for IDMA emulation, or as a CAM interface signal for Ethernet.
PB[21]
SMTXD2
L1CLKOB Bidirectional
(Optional:
Open-drain)
General-Purpose I/O Port B Bit 21ÑBit 21 of the general-purpose I/O port B.
SMTXD2ÑSMC2 transmit data output.
L1CLKOBÑClock output from the serial interface TDM port B.
PB[20]
SMRXD2
L1CLKOA Bidirectional
(Optional:
Open-drain)
General-Purpose I/O Port B Bit 20ÑBit 20 of the general-purpose I/O port B.
SMRXD2ÑSMC2 receive data input.
L1CLKOAÑClock output from the serial interface TDM port A.
PB[19]
RTS1
L1ST1 Bidirectional
(Optional:
Open-drain)
General-Purpose I/O Port B Bit 19ÑBit 19 of the general-purpose I/O port B.
RTS1ÑRequest to send modem line for SCC1.
L1ST1ÑOne of four output strobes that can be generated by the serial interface.
PB[18]
RTS2
L1ST2 Bidirectional
(Optional:
Open-drain)
General-Purpose I/O Port B Bit 18ÑBit 18 of the general-purpose I/O port B.
RTS2ÑRequest to send modem line for SCC2.
L1ST2ÑOne of four output strobes that can be generated by the serial interface.
PB[17]
L1RQB
L1ST3 Bidirectional
(Optional:
Open-drain)
General-Purpose I/O Port B Bit 17ÑBit 17 of the general-purpose I/O port B.
L1RQBÑD-channel request signal for the serial interface TDM port B.
L1ST3ÑOne of four output strobes that can be generated by the serial interface.
PB[16]
L1RQA
L1ST4 Bidirectional
(Optional:
Open-drain)
General-Purpose I/O Port B Bit 16ÑBit 16 of the general-purpose I/O port B.
L1RQAÑD-channel request signal for the serial interface TDM port A.
L1ST4ÑOne of four output strobes that can be generated by the serial interface.
PB[15]
BRGO3 Bidirectional General-Purpose I/O Port B Bit 15ÑBit 15 of the general-purpose I/O port B.
BRGO3ÑBRG3 output clock.
PB[14]
RSTRT1 Bidirectional General-Purpose I/O Port B Bit 14ÑBit 14 of the general-purpose I/O port B.
RSTRT1ÑSCC1 serial CAM interface outputs that marks the start of a frame.
PC[15]
DREQ0
RTS1
L1ST1 Bidirectional General-Purpose I/O Port C Bit 15ÑBit 15 of the general-purpose I/O port C.
DREQ0ÑIDMA channel 0 request input.
RTS1ÑRequest to send modem line for SCC1.
L1ST1ÑOne of four output strobes that can be generated by the serial interface.
PC[14]
DREQ1
RTS2
L1ST2 Bidirectional General-Purpose I/O Port C Bit 14ÑBit 14 of the general-purpose I/O port C.
DREQ1ÑIDMA channel 1 request input.
RTS2ÑRequest to send modem line for SCC2.
L1ST2ÑOne of four output strobes that can be generated by the serial interface.
PC[13]
L1RQB
L1ST3 Bidirectional General-Purpose I/O Port C Bit 13ÑBit 13 of the general-purpose I/O port C.
L1RQBÑD-channel request signal for the serial interface TDM port B.
L1ST3ÑOne of four output strobes that can be generated by the serial interface.
Table 3-1. Signal Descriptions (Continued)
Name Type Description