VMIVME-2533 Differential Digital Output Board
10
Functional Block Diagram
The VMIVME-2533 Differential Digital Output Board consists of VMEbus
compatibility logic, four 8-bit output registers, eight 4-bit differential line drivers, a
Control and Status Register, and eight 4-bit differential line receivers used by the
Built-in-Test logic, as shown in Figure 3 below.
The VMEbus compatibility logic controls data transfer allowing 8-, 16-, or 32-bit
VMEbus data transfers.
The four 8-bit output registers latch 32 bits of output data, which drives the eight
RS485/422 compatible differential output voltage drivers to the field connector.
The Control and Status Register (CSR) contains three bits. One bit controls the
on-board Fail LED, while the other two bits, along with some additional logic, control
the test functions of the board.
Built-in-Test logic enables the output data to be read back without affecting the signals
to the field. System reset puts the board into test mode for immediate loopback
testing.
Figure 3
VMIVME-2533 Functional Block Diagram
VMEbus
FOUNDATION
LOGIC
V
M
E
b
u
s
FOUR
8-BIT
OUTPUT
REGISTERS
DATA
BUS
EIGHT
4-BIT
DIFFERENTIAL
LINE DRIVERS
32
DIFFERENTIAL
OUTPUTS
EIGHT
4-BIT
DIFFERENTIAL
LINE
RECEIVERS
FAIL LED
CSR AND
CONTROL
LOGIC
A
D
D
R
E
S
S
B
U
S
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