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94
9.4
Status Register
The status register provides device information to the host system. All bit functions adhere to the definitions in the
PCI Local Bus Specification
, as seen in the following bit descriptions. Bits in this register may be read normally. A
bit in the status register is reset when a 1 is written to that bit location; a 0 written to a bit location has no effect. See
Table 93 for a complete description of the register contents.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Name
Status
Type
RCU
RCU
R
R
RCU
R
R
R
R
R
R
R
RU
R
R
R
Default
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
Register:
Offset:
Type:
Default:
Status
06h
Read/Clear/Update, Read-only
0210h
Table 93. Status Register Description
BIT
FIELD NAME
TYPE
DESCRIPTION
15
PAR_ERR
RCU
Detected parity error. Bit 15 is set to 1 when either an address parity or data parity error is detected.
14
SYS_ERR
RCU
Signaled system error. Bit 14 is set to 1 when SERR is enabled and the Smart Card controller has
signaled a system error to the host.
13
MABORT
R
This function does not support bus mastering. This bit is hardwired to 0.
12
TABT_REC
R
This function does not support bus mastering and never receives a target abort. This bit is hardwired
to 0.
11
TABT_SIG
RCU
Signaled target abort. Bit 11 is set to 1 by the Smart Card controller when it terminates a transaction
on the PCI bus with a target abort.
109
PCI_SPEED
R
DEVSEL timing. Bits 10 and 9 encode the timing of DEVSEL and are hardwired to 01b, indicating that
the Smart Card controller asserts this signal at a medium speed on nonconfiguration cycle accesses.
8
DATAPAR
R
This function does not support bus mastering. This bit is hardwired to 0.
7
FBB_CAP
R
Fast back-to-back capable. The Smart Card controller cannot accept fast back-to-back transactions;
therefore, bit 7 is hardwired to 0.
6
RSVD
R
Reserved. Bit 6 returns 0 when read.
5
66MHZ
R
66-MHz capable. The Smart Card controller operates at a maximum PCLK frequency of 33 MHz;
therefore, bit 5 is hardwired to 0.
4
CAPLIST
R
Capabilities list. Bit 4 returns 1 when read, indicating that the Smart Card controller supports additional
PCI capabilities. The linked list of PCI power-management capabilities is implemented in this function.
3
INT_STAT
RU
Interrupt status. This bit reflects the interrupt status of the function. Only when bit 10 (INT_DISABLE)
in the command register (see Section 7.3) is a 0 and this bit is 1, is the function’s INTx signal asserted.
Setting the INT_DISABLE bit to 1 has no effect on the state of this bit. This bit is set only when a valid
interrupt condition exists. This bit is not set when an interrupt condition exists and signaling of that event
is not enabled.
20
RSVD
R
Reserved. Bits 30 return 0s when read.