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Revision B User Manual
for the VME-SIO4: Board Revision: A
General Standards Corporation
8302A Whitesburg Drive Huntsville, AL 3580, Phone: (256) 880-8787
10
1.3
BOARD CONTROL REGISTER
The board control register will provide configuration of the board, including the self-test modes.
1.4
BOARD STATUS REGISTER
The board status register will provide status with regard to receive FIFO status and transmit FIFO status.
1.5
SYNC WORD SELECTION
The sync word selection is used to provide an interrupt upon the reception of a particular character. This character is
software programmable.
1.6
DATA RECEPTION
Data is received into the Zilog Z16C30, after which the software may retrieve the data from the Z16C30 or the main
Rx FIFOs, depending on how the Z16C30 has been initialized.
1.7
DATA TRANSMIT
Data is received into the Zilog Z16C30, after which the software may write data to the master FIFOs or to the Zilog
depending on how the Z16C30 has been initialized. At this point, the Zilog can be placed into a transmit mode.
1.8
LOOP-BACK TESTING
The card is designed with sufficient built-in loop-back testing capability in order to allow software to perform fault
isolation to the VME card level, and replacement within 30 minutes.
The following modes of loop-back testing are supported:
a. internal loop-back testing (does not drive the cable);
b. external loop-back testing via an external loop-back test cable.
1.9
ERROR DETECTION
Error detection built into the board includes the following:
a. parity error detection;
b. CRC error detection;
c. Rx overrun;
d. Tx underrun.
1.10
INTERRUPTS
Interrupts will be provided for the following conditions:
a. Sync word detected;
b. Tx FIFO empty;
c. Rx FIFO not empty;
d. Rx FIFO almost full.