VXI?Corporation F80 Especificaciones descargar pdf (Pagina 62)

Page 62 Pentek Model 6526 Operating Manual

Rev. A

3.5 VMEbus A24/A32 Global Slave Register Memory (continued)

3.5.13 Input FIFO A Control Register (continued)

3.5.13.2 Write Mode − Bits D3 to D2

These two bits determine when and how data can be written to

Input FIFO A. When both of these bits are cleared to the logic '0'

state, Input FIFO A is ready to accept data (or is accepting data),

and will remain write−enabled until the state of bit D3 changes.

When D3 is set to the logic '1' state (regardless of the state of D2),

the FIFO write is disabled — all data in FIFO A at the time of this

transition is retained, but no further data is accepted. When bit D2 is

set to the logic '1' state and D3 is a logic '0', Input FIFO A is write−

enabled when SYNC0 goes to a logic '1'.

3.5.13.3 Read Mode − Bits D5 to D4

These two bits determine when and how data can be read from

Input FIFO A. When both of these bits are cleared to the logic '0'

state, Input FIFO A is ready to output data (or is outputting data).

When both bits are set to the logic '1' state, the FIFO read is dis−

abled — all data in FIFO A is retained and data is accepted until the

FIFO is filled, but no data may be read from the FIFO.

When bit D4 is set to logic '1' and D5 is a logic '0', Input FIFO A is

read−enabled after the delay set in the Input FIFO A Delay Control

(see Section 3.5.11). When bit D5 is set to logic '1' and D4 is a logic

'0', Input FIFO A is read−enabled after the delay set in the Input

FIFO B Delay Control Register has elapsed following the assertion

of the SYNC1 signal (see Section 3.5.12).

Table 3−22: Input FIFO A Write Mode

D3 D2 Write Mode

0 0 Write Enabled (default after reset)

0 1 Write Enabled on Sync0

1 Don’t Care Write Disabled

Table 3−23: Input FIFO A Read Mode

D5 D4 Read Mode

0 0 Read Enabled (default after reset)

0 1 Read Enabled on FIFO A Delay after Sync0

1 0 Read Enabled on FIFO B Delay after Sync1

1 1 Read Disabled

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VXI?Corporation F80 Especificaciones Pagina 62