M68360QUADS-040 Hardware User’s Manual
FUNCTIONAL DESCRIPTION
32
4.11.1
DRAM Controller
The slave QUICC device provides the necessary control signals for the DRAM module. The debugger on
the M68360QUADS-040 reads the presence detect pins (SIMM1 - SIMM4) of the SIMM found in the status
register and sets the DRAM Controller parameters according to the DRAM module’s size and access time.
The available combinations of the presence detect pins are described in TABLE 4-1.
The hardware connection of the slave QUICC to the DRAM module is straight-forward. Since the slave
QUICC doesn’t support address multiplexing for external masters, external address multiplexers are used
to drive the DRAM address lines.
4.11.2
Chip Select TA~ and DSACK~ Generator
The slave QUICC device provides the Chip Select signals for the DRAM, EPROM, bursting EPROM, and
bursting SRAM on the ADS. It also generates the TA~ signal for the 68EC040 during master accesses and
DSACK~ signals for the QUICC during internal accesses, this, according to the access time of the devices
and the working frequency of the board. No external logic is required for the connection of the slave QUICC
to the devices.
4.11.3
ADI Port
The ADI parallel port supplies the parallel link from the M68360QUADS-040 to various host computers.
This port is connected via a 37 line cable to a special board called ADI (Application Development Interface)
installed in the host computer. Two versions of the ADI board are available to support connection to IBM-
PC/XT/AT and SUN-4 SPARC stations. It is possible to connect the M68360QUADS-040 board to these
computers provided that the appropriate software drivers are installed on them.
Each M68360QUADS-040 can have 8 possible slave addresses set for its ADI port, enabling up to 8
M68360QUADS-040 boards to be connected to the same ADI board.
TABLE 4-1. DRAM SIMM Types
SIMM(4:1)
SIMM Type
SIMM Organization
Access
Time (nsec)
Control
Signals
0000
MCM36100S10
1M x 36
100
RAS1
0001
MCM36512S10
512K x 36
100
RAS1, RAS2
0010
MCM36256S10
256K x 36
100
RAS1
0011
MCM36200S10
2M x 36
100
RAS1, RAS2
0100
MCM36100S80
1M x 36
80
RAS1
0101
MCM36512S80
512K x 36
80
RAS1, RAS2
0110
MCM36256S80
256K x 36
80
RAS1
0111
MCM36200S80
2M x 36
80
RAS1, RAS2
1000
MCM36100S70
1M x 36
70
RAS1
1001
MCM36512S70
512K x 36
70
RAS1, RAS2
1010
MCM36256S70
256K x 36
70
RAS1
1011
MCM36200S70
2M x 36
70
RAS1, RAS2
1100
MCM36B100ASG60
1M x 36
60
RAS1
1101
MCM36B512ASG60
512K x 36
60
RAS1, RAS2
1110
MCM36B256ASG60
256K x 36
60
RAS1
1111
MCM36B200ASG60
2M x 36
60
RAS1, RAS2
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Freescale Semiconductor, Inc.
For More Information On This Product,
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