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SID
NO.
o
o
HP 27130B
Table 3-6. SIO Special Functions (Continued)
SID
MNEMONIC
MUX CARD
MNEMONIC
RDYA-
DMA2-
(OUTPUT)
RDYB-
DMAO-
(OUTPUT)
FUNCTION
On power up (reset), if the diagnostic hood is
installed, the HDOD_ON- signal will be pulled to
ground.
If the diagnostic hood is not installed,
the HODD_DN- signal will be pulled to +5V.
Active LOW.
DMA2- is tied to the
IRQ2- input of the MIC.
When
RDYA- is programmed as RDYA-
(READY-), it is a DMA handshake
Signal.
To the MIC's DMA
controller, DMA2- indicates that
channel A of SID 0 is ready to
transfer data to or from memory.
By using the MIC's DMA capability,
channel A of SID 0 (channel 0 of
the MUX card) can support very high
data rates.
On power up (reset) DMAO- is floating.
Active LOW.
DMAO- is tied to the
IRQO- input of the MIC.
When
RDYB- is programmed as RDYB-
(READY-), it is a DMA handshake
Signal.
To the MIC's DMA
controller, DMAO- indicates that
channel B of SID 0 is ready to
transfer data to or from memory.
By using the MIC's DMA capability,
channel B of SID 0 (channel 1 of
the MUX card) can support very high
data rates.
On power up (reset), DMA2- is floating.
3-17
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