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S16A User’s Guide Registers
EDT, Inc. October, 1996 27
SBus Addresses
The addresses listed in the figure below are offsets from the SBus slot base address. Obtain the SBus base
address from the SBus host documentation. The following sections describe the S16A registers in detail.
0x0006.0000 reserved
. . . not used
0x0004.00C4 uart_data
0x0004.00C0 uart_csr
. . . not used
0x0004.0080 dac_ctrl
. . . not used
0x0004.0044 dio_data
0x0004.0040 dio_dir
0x0004.003C nxt_cnt_ctl_3
0x0004.0038 cur_cnt_3
0x0004.0034 nxt_dma_add_3
0x0004.0030 cur_dma_add_3
. . . . . .
0x0004.000C nxt_cnt_ctl_0
0x0004.0008 cur_cnt_0
0x0004.0004 nxt_dma_add_0
0x0004.0000 cur_dma_add_0
. . . not used
0x0002.0008 xpg_stat not used
0x0002.0004 xpg_din not used
0x0002.0000 xpg_reg not used
. . . not used
0x0000.FFFC
S16A ROM
0x0000.0000
Byte 0 1 2 3
Word 0 1
Figure 1. S16A SBus Addresses