Samsung MSYS 5150, Service Manual

Page: 62 / 210

S I G N A L PIN No. Type Description
GPIO[11]: 188 O KS32C6100 power ready. nCPUPWR is a status nCPUPWR signal
n C P U P W R that is output to the laser printer engine. Actually, any I/O port pin
can be mapped to output this signal without any modifications.
GPIO[10]: 187 O Parallel data output enable. When PPDOE is PPDOE “1”, the
P P D O E parallel port data bus, PPD[7:0], is in output mode. Otherwise it is
in input mode.
GPIO[9]: 186 O Interrupt acknowledge for external ExtiACK1 interrupt request
ExtlACK1 ExitREQ1.
GPIO[8]: 185 O Interrupt acknowledge for external interrupt ExtiACK0 request
ExtlACK0 ExitREQ0.
GPIO[7]: 182 I External interrupt request input 1. For a valid ExtiREQ1 request,
ExtlREQ1 this signal must be held active for at least four machine cycles.
GPIO[6]: 181 I External interrupt request input 0. For a valid request, this
ExtlREQ0 signal must be held active for at least four machine cycles.
GPIO[5]: 180 O D M A acknowledge for external DMA2 request . The active
ExtDACK2 output signal is generated whenever a DMA transfer on GDMA1 is
completed.
GPIO[4]: 179 O D M A acknowledge for external DMA1 request . The active
ExtDACK1 output signal is generated whenever a DMA transfer on GDMA0 is
completed.
GPIO[3]: 178 O D M A acknowledge for external DMA0 request . The active
ExtDACK0 output signal is generated whenever a DMA transfer on GDMA i s
completed.
GPIO[2]: 177 I External DMA2(GDMA1) request. ExtDREQ2 is asserted by a
ExtDREQ2 peripheral device to request a data transfer using GDMA1. This
signal must be held active for at least four machine cycles.
GPIO[2]: 176 I External DMA1(GDMA0) request. ExtDREQ1 is asserted by a
ExtDREQ1 peripheral device to request a data transfer using GDMA0. This
signal must be held active for at least four machine cycles.
GPIO[2]: 175 I External DMA0(GDMA) request. ExtDREQ0 is asserted by a
ExtDREQ0 peripheral device to request a data transfer using GDMA. This
signal must be held active for at least four machine cycles.
NOTE: The I/O port pin assignments described in this table are presented as only one example.
You can modify the port map as necessary in order to meet the requirements of a specific application.
Table 1-1 KS32C6100 Signal Descriptions (Cont.)
5-14 Samsung Electronics
Circuit Description