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eDisplay (OP7200)
3.9 OP7200 CPLD
All the random logic used to control the OP7200 is contained within a single ComPlex
Logic Device (CPLD). The AMD ATF1500A contains 32 macrocells and is packaged in a
44-pin TQFP. This device contains decoding and a number of I/O bits that can be set to
high or low to control various functions of the OP7200.
The CPLD interfaces to the address and data bus on the RabbitCore module, and is write-
only. Two chip select lines, /PE4 and /PE5, are used to enable the device. /PE4 and /PE5
are configured in software as I/O strobes, and set the base address used by the CPLD. /PE4
is used when selecting one of the sixteen I/O control bits associated with the eight driver
circuits. /PE5 is used with the remainder of the controls. The control bits within the CPLD
normally can be set and reset independently of one another. The SINK and SOURCE out-
puts are different in that both the SINK and SOURCE outputs for a particular driver can-
not be asserted simultaneously. If either the SINK or SOURCE output is asserted, and the
software tries to set the other, the operation is ignored and the bit will not be set. The pur-
pose of this interlock is to prevent damage to the driver circuit by not allowing both cur-
rent sourcing and sinking to be enabled simultaneously.
Table 6. CPLD Parameters
/PE5
/PE4
A3–0
D0
Signal
Function
1
0
0000
1
SINK0
Enable Sink Output 0
1
0
0000
0
SINK0
Disable Sink Output 0
1
0
0001
1
SINK1
Enable Sink Output 1
1
0
0001
0
SINK1
Disable Sink Output1
1
0
0010
1
SINK2
Enable Sink Output 2
1
0
0010
0
SINK2
Disable Sink Output 2
1
0
0011
1
SINK3
Enable Sink Output 3
1
0
0011
0
SINK3
Disable Sink Output 3
1
0
0100
1
SINK4
Enable Sink Output 4
1
0
0100
0
SINK4
Disable Sink Output 4
1
0
0101
1
SINK5
Enable Sink Output 5
1
0
0101
0
SINK5
Disable Sink Output 5
1
0
0110
1
SINK6
Enable Sink Output 6
1
0
0110
0
SINK6
Disable Sink Output 6
1
0
0111
1
SINK7
Enable Sink Output 7
1
0
0111
0
SINK7
Disable Sink Output 7
1
0
1000
1
SOURCE0 Enable Source Output 0
1
0
1000
0
SOURCE0 Disable Source Output 0
1
0
1001
1
SOURCE1 Enable Source Output 1
1
0
1001
0
SOURCE1 Disable Source Output 1
1
0
1010
1
SOURCE2 Enable Source Output 2
Содержание eDisplay OP7200
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