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Memory Map and Interrupts
3-11
NCR89C105 SLAVIO Configuration Control
Note
All bits in the Diagnostic Message Register are unaffected by system resetbut
contains random information after a power-on reset.
3.3.3
Miscellaneous System Functions
The NCR89C105 contains two 8-bit Auxiliary I/O Registers: one dedicated
to controlling system power-down; and one used to support several
hardware functions that do not fit well elsewhere. These registers are
located at physical addresses 0x7190000 (aux1) and 0x719100000 (Aux 2).
LED/Floppy (Aux 1)Register
A system reset clears all output bits (Bits 3, 2, 1, and 0) to 0. The
FPY_DENSENSE chip pin controls input bit (Bit 5). The unused bits (Bits
4, 6, and 7) are unaffected by writes, and always read 0.
Bits 7:6
Reserved - always read 0.
Bit 5
D - Floppy Density Sense (not used).
Bit 4
Reserved - always read 0.
Bit 3
E - Link Test Enable. This bit is directly reflected in the
LINK_TEST_EN pin. It controls the AT&T 7213 LTE pin.
Bit 2
M - Monitor/Mouse Mux. This bit is directly reflected on the
MON_MSE_MUX pin.
Bit 1
T - Terminal Count (1 = TC). Writing a 1 to this bit sends a 4
SBus clock wide TC pulse to the 82077 floppy controller.
This bit is self-clearing; it always reads 0. Writing a 0 has no
effect.
Bit 0
L (1 = on, 0 = off). - This bit controls the system LED on the
front panel.
Figure 3-5 Auxiliary I/O Register 1
D
7
6
5
4
3
2
1
0
E
M
T
L
S3GX_TRMBook Page 11 Friday, September 19, 1997 11:39 am
Содержание SPARCbook 3 series
Страница 1: ...Series Technical Reference Manual 980327 02 3 S3GX_TRMBook Page i Friday September 19 1997 11 39 am...
Страница 8: ...viii S3GX_TRMBook Page viii Friday September 19 1997 11 39 am...
Страница 28: ...1 16 Architecture Overview Microcontroller Subsystem S3GX_TRMBook Page 16 Friday September 19 1997 11 39 am...
Страница 44: ...2 16 The SPARC CPU SBus Controller S3GX_TRMBook Page 16 Friday September 19 1997 11 39 am...
Страница 76: ...5 8 SCSI Controller DMA Support S3GX_TRMBook Page 8 Friday September 19 1997 11 39 am...
Страница 82: ...6 6 Ethernet Interface DMA Support for Network Operations S3GX_TRMBook Page 6 Friday September 19 1997 11 39 am...
Страница 96: ...7 14 PCMCIA Interface Microcontroller Registers S3GX_TRMBook Page 14 Friday September 19 1997 11 39 am...
Страница 146: ...9 28 MODEM Class 2 Fax Command Set S3GX_TRMBook Page 28 Friday September 19 1997 11 39 am...
Страница 180: ...11 30 Display Interface RAMDAC S3GX_TRMBook Page 30 Friday September 19 1997 11 39 am...
Страница 210: ...B 10 Connector Information Removable Hard Drive SCSI Connector S3GX_TRMBook Page 10 Friday September 19 1997 11 39 am...
Страница 216: ...Index vi S3GX_TRMBook Page vi Friday September 19 1997 11 39 am...