XIO2000AI TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS], XIO2000AI Datasheet - Page 88
XIO2000AI
Manufacturer Part Number
XIO2000AI
Description
PCI Express to PCI Bus Translation Bridge
Manufacturer
TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS]
Datasheet
1.XIO2000AI.pdf
(159 pages)
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Classic PCI Configuration Space
4.58 Serial-Bus Control and Status Register
† These bits are reset by a PCI Express reset (PERST), a GRST, or the internally-generated power-on reset.
78
BIT
7†
5†
4†
3†
2†
1†
0†
6
SCPS155C
The serial-bus control and status register controls the behavior of the serial-bus interface. This register also
provides status information about the state of the serial bus. See Table 4−32 for a complete description of the
register contents.
FIELD NAME
RESET STATE
BIT NUMBER
SBDETECT
PROT_SEL
ROMBUSY
ROM_ERR
REQBUSY
PCI register offset:
Register type:
Default value:
SB_ERR
SBTEST
RSVD
Table 4−32. Serial-Bus Control and Status Register Description
ACCESS
RWU
RCU
RCU
RW
RW
RU
RU
7
0
R
6
0
Protocol select. This bit selects the serial-bus address mode used.
Reserved. Returns 0b when read.
Requested serial-bus access busy. This bit is set when a software-initiated serial-bus cycle is in
progress.
Serial EEPROM access busy. This bit is set when the serial EEPROM circuitry in the bridge is
downloading register defaults from a serial EEPROM.
Serial EEPROM detected. This bit enables the serial-bus interface. The value of this bit controls
whether the GPIO4//SCL and GPIO5//SDA terminals are configured as GPIO signals or as
serial-bus signals. This bit is automatically set to 1b when a serial EEPROM is detected.
Note: A serial EEPROM is only detected once following PERST.
Serial-bus test. This bit is used for internal test purposes. This bit controls the clock source for the
serial interface clock.
Serial-bus error. This bit is set when an error occurs during a software-initiated serial-bus cycle.
Serial EEPROM load error. This bit is set when an error occurs while downloading registers from a
serial EEPROM.
0 = Slave address and word address are sent on the serial-bus (default)
1 = Only the slave address is sent on the serial-bus
0 = No serial-bus cycle
1 = Serial-bus cycle in progress
0 = No EEPROM activity
1 = EEPROM download in progress
0 = No EEPROM present, EEPROM load process does not happen. GPIO4//SCL and
1 = EEPROM present, EEPROM load process takes place. GPIO4//SCL and GPIO5//SDA
0 = Serial-bus clock at normal operating frequency ~ 60 kHz (default)
1 = Serial-bus clock frequency increased for test purposes ~ 4 MHz
0 = No error
1 = Serial-bus error
0 = No error
1 = EEPROM load error
5
0
GPIO5//SDA terminals are configured as GPIO signals.
terminals are configured as serial-bus signals.
B3h
Read-only, Read/Write, Read/Clear
00h
4
0
3
0
2
0
1
0
DESCRIPTION
0
0
April 2007 Revised October 2008
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