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PCMCIA Interface
7-9
TS102 Registers
I/O cards replace the two battery voltage signals with card status changed
and audio waveform input signals. In this case the battery status changed
interrupt becomes a card status changed interrupt, and the card status must
then be read from the card.
7.3.2
Card status register
The card status register contains card status and control bits.
Bit 15
ACEN – Card Access Enable
Accesses to the card are enabled when this bit is set (1)
Bit 14
RIEN – Ring Indicator Enable.This is no longer supported.
Bit 13
VccEN – Vcc enable. When this bit is cleared (0) power is
enabled to the card.
Bit 12
RDY – Card ready/not busy status. This bit indicates the
status of the card RDY/BSY* signal. Note that this signal
becomes IREQ* on I/O cards, and the RDY/BSY* status
may be available in the card pin replacement register, if this
bit is implemented in it. Since the RDY/BSY* signal and
IREQ* are one and the same, it is possible to generate an
interrupt on BSY* becoming asserted, since the interrupt
Bit
Name
Function
Asserted
Reset
0
PRES
Card is present
1
0
1
IO
Card is memory or I/O
1
0
2
TYP3
Card is type 3 (disk)
1
0
3
Vcc
Vcc voltage control
0
5:4
Vpp1[1:0]
Vpp1 voltage control
00
7:6
Vpp2[1:0]
Vpp2 voltage control
00
8
WP
Write protect status
1
0
10:9
BVD[1:0]
Battery voltage detect
11
LVL
Card IRQ interrupt level/edge
control
1
0
12
RDY
Card ready/not busy status
1
0
13
Vccen
Card Vcc enable
0
0
14
RIEN
Ring indicate enable
1
0
15
ACEN
Card access enable
1
0
Table 7-6 Card Status Register
S3GX_TRMBook Page 9 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...