M68360QUADS-040 Hardware User’s Manual
FUNCTIONAL DESCRIPTION
34
•
ADS_SEL(0:2) - ’I’
These three input lines determine the slave address of the M68360QUADS-040 being accessed
by the host computer. Up to 8 boards can be addressed by one ADI board.
•
ADS_ALL - ’I’
This input line is used to reset or abort program execution on all M68360QUADS-040
development boards that are connected to the same ADI board.
•
HOST_ENABLE~ - ’I’
This line is always driven low by the ADI board. The M68360QUADS-040 software uses this line
to determine if a host is connected to the ADI port.
•
ADS_BRK - ’I’
When a host is connected, this line is used in conjunction with the addressing lines or with the
ADS_ALL line to generate a non-maskable interrupt (interrupt level 7) to the QUICC.
•
ADS_RESET - ’I’
When a host is connected, this line is used in conjunction with the addressing lines or with the
ADS_ALL line to generate a reset (Hard or Soft) to the M68360QUADS-040 board.
•
HOST_REQ -’I’
This signal initiates a host to M68360QUADS-040 write cycle.
•
ADS_ACK - ’O’
This signal is the M68360QUADS-040 response to the HOST_REQ signal, indicating that the
board has detected the assertion of HOST_REQ.
•
ADS_REQ - ’O’
This signal initiates an M68360QUADS-040 to host write cycle.
•
HST_ACK - ’I’
This signal serves as the host’s response to the ADS_REQ signal.
•
HOST_BRK~ - ’O’
This open-collector signal generates an interrupt to the host. This signal is common to all
M68360QUADS-040 boards that are connected to the same ADI.
•
ADS_INT - ’O’
This line is polled by the host computer during its interrupt acknowledge cycle to determine which
M68360QUADS-040 board has generated the interrupt.
•
INT_ACK - ’I’
This line is asserted by the host at the end of its interrupt acknowledge cycle. This signal is used
by the M68360QUADS-040 hardware to negate the HOST_BRK~ signal. The software in the
M68360QUADS-040 must negate the ADS_INT signal upon detecting the assertion of INT_ACK
to support the daisy-chain interrupt structure.
In addition, this signal selects between the type of reset applied to the selected board(s). When
’1’ is driven, SOFT reset is applied and when ’0’ - HARD reset is applied.
•
HOST_VCC - ’I’ (three lines)
These lines are power lines from the host computer. In the M68360QUADS-040, these lines are
used by the software to determine if the host computer is powered on.
•
PD(0:7) - ’I/O’
These eight I/O lines are the parallel data bus. This bus is used to transmit and receive data from
the host computer.
4.11.4
RS-232 Serial Port
The serial port is provided by one of the slave QUICC serial channels. The M68360QUADS-040 can be
connected to a VT100 compatible terminal or to a host computer through the serial port.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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