Intel 386

5-5
DEVICE CONFIGURATION
Figure 5-2. Configuration of DMA, Bus Arbiter, and Refresh Unit
A2516-02
DREQ0
DMAACK0#
DREQ1
DMAACK1#
DMAINT
DMA
Bus Arbiter
Refresh Unit
HOLD
HLDA
REFRESH#
RBFDMA1 (SIO1 )
TXEDMA0 (SIO0)
SSRBF (SSIO)
DRQ0
(DCD1#)†
To SIO1
DRQ1
(RXD1)
To SIO1
DACK0#
(CS5#)
DMACFG.3
From CSU
DACK1#
(TXD1)
DMACFG.7
From SIO1
DMACFG.6:4
3
DMACFG.2:0
PINCFG.4
PINCFG.2
EOP#
(CTS1#)
From SIO1
PINCFG.3
HOLD
(P1.6)
To/From I/O Port 1
P1CFG.6
HLDA
(P1.7)
To/From I/O Port 1
P1CFG.7
REFRESH#
(CS6#)
From CSU
PINCFG.6
3
† Alternate pin signals are in parentheses.
End of Process
OUT2 (TCU)
RBFDMA0 (SIO0)
TXEDMA1 (SIO1)
SSTBE (SSIO)
0
1
2
3
4
5
6
7
RBFDMA0 (SIO0)
TXEDMA1 (SIO1)
SSTBE (SSIO)
OUT1 (TCU)
RBFDMA1 (SIO1)
TXEDMA0 (SIO0)
SSRBF (SSIO)
0
1
2
3
4
5
6
7
1
0
1
0
1
0
0
1
0
1
0
1
To ICU
To
Core
HOLD
From
Core
HLDA