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S3C2501X
12.3.3 I/O PORT CONTROL REGISTER FOR GDMA (IOPGDMA)
If the port is used for a function's port such as an external GDMA Req/Ack signal, its signal function is determined
by the IOPGDMA register. IOPGDMA register is used to configure GDMA Req/Ack signal. I/O ports provide 3-tap
filtering, and you can select filtering on or off. External signals can be active high or low, so you must set the
active high or low bits for the proper operation.
Register
Address
IOPGDMA
0xF0030010
31
IOPGDMA
Table 12-4. IOPGDMA Register
R/W
R/W
Reserved
[11] Control external GDMA Acknowledge3 output for port 21(xGDMA_Ack3)
[11] 0 = active low
[10] Control external GDMA Acknowledge2 output for port 20 (xGDMA_Ack2)
[10] 0 = active low
[9] Control external GDMA Acknowledge1 output for port 19(xGDMA_Ack1)
[9] 0 = active low
[8] Control external GDMA Acknowledge0 output for port 18 (xGDMA_Ack0)
[8] 0 = active low
[7:6] Control external GDMA Request3 input for port 17 (xGDMA_Req3)
[7] 0 = filtering off
[6] 0 = active low
[5:4] Control external GDMA Request2 input for port 16 (xGDMA_Req2)
[5] 0 = filtering off
[4] 0 = active low
[3:2] Control external GDMA Request1 input for port 15 (xGDMA_Req1)
[3] 0 = filtering off
[2] 0 = active low
[1:0] Control external GDMA Request0 input for port 14 (xGDMA_Req0)
[1] 0 = filtering off
[0] 0 = active low
Figure 12-4. I/O Port Control Register for GDMA (IOPGDMA)
Description
I/O port special function register for GDMA
1 = active high
1 = active high
1 = active high
1 = active high
1 = filtering on
1 = active high
1 = filtering on
1 = active high
1 = filtering on
1 = active high
1 = filtering on
1 = active high
12
11
10
9
8
7
6
5
X
X
X
X
X
X
X
I/O PORTS
Reset Value
0x00000000
4
3
2
1
0
X
X
X
X
X
12-7
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