—14—
CXD1186CQ/CR
(3) XHAC/SDRQ (Host DMA acknowledge/SCSI data request, input)
When HMDS is at “L”, DMA acknowledge negative logic signal from host.
When HMDS is at “H”, DMA data request positive logic signal from SCSI control IC.
(4) XHWR (Host write, negative logic I/O)
When HMDS is at “L” and ADMAEN (DMACTL register, bit4) also at “L”, data write strobe input from
host.
When HMDS is at “H” and ADMAEN at “L”, data write strobe output to SCSI control IC.
When ADMAEN is at “H”, data write strobe output to audio processor (ADP).
(5) XHRD (Host read, negative logic I/O)
When HMDS is at “L” and ADMAEN also at “L”, data read strobe input from host.
When HMDS is at “H” and ADMAEN at “L”, data read strobe output to SCSI control IC.
When ADMAEN is at “H”, data read strobe output to ADP.
(6) XHCS (Host chip select, negative logic input)
This pin is pulled up inside the IC by means of a resistor at a standard 50 kΩ.
When HMDS is at “L”, chip select input from host.
When HMDS is at “H”, this signal is not used. Either fix to “H” or keep open.
(7) HA0 and 1 (Host address, input)
These pins are pulled up inside the IC by means of a resistor at a standard 50 kΩ.
When HMDS is at “L”, address input from the host.
When HMDS is at “H”, these signals are not used. Either fix to “H” or keep open.
(8) HDB0 to 7 (Host data bus, I/O)
Host data bus signal.
(9) HDBP (Host data bus, I/O)
Host data bus signal for error pointer.
(10) HINT (HOST interrupt, output)
This pin is an open drain output.
When HMDS is at “L”, interrupt request negative logic output to host.
When HMDS is at “H”, this signal is not used.
(11) XTC (Terminal count, negative logic output)
This is pulled up inside the IC by means of a resistor at a standard 50 kΩ.
When HMDS is at “L”, data transfer complete instruction negative logic input from the host.
When HMDS is at “H”, this signal is not used. Either fix to “H” or keep open.
1.5 Audio processor (ADP) interface (2 pins)
(1) ADRQ (audio processor DMA request, positive logic input)
This pin is pulled down inside the IC by means of a resistor at a standard 50 kΩ.
DMA data request signal to ADP. When not connected to ADP and CXD1186Q, either fix to “L” or keep
open.
(2) XAAC (audio processor DMA acknowledge, negative logic output)
DMA acknowledge signal from ADP.
1.6 Others (4 pins)
(1) XTL1 (Crystal1, input)
(2) XTL2 (Crystal2, output)
Crystal oscillator connecting pin for master clock oscillation.
(3) HCLK (halfclock, output)
Half frequency divided clock of the master clock.
(4) XRST (Reset, negative logic input)
Chip reset signal.
Pins BDB0 to 7, BDBP, DB0 to 7, HDB0 to 7 and HDBP are pulled up inside the IC by means of a
resistor at a standard 25 kΩ.