Datasheet

2−7
Table 2−5. Reset and Miscellaneous Terminals
TERMINAL
NAME
NO.
I/O DESCRIPTION
NAME
PGE GGW
I/O
DESCRIPTION
G_RST 7 E01 I
Global power reset. This reset brings all of the TSB82AA2B internal registers to their default states,
including those registers not reset by PCI_RST
. When G_RST is asserted, the device is completely
nonfunctional. Additionally, G_RST
must be asserted a minimum of 2 ms after both 3.3 V and 1.8 V are
valid at the device.
When implementing wake capabilities from the 1394 host controller, it is necessary to implement two
resets to the TSB82AA2B device. G_RST
is designed to be a one-time power-on reset, and PCI_RST
must be connected to the PCI bus RST.
MFUNC 1 C01 I/O
Multifunction terminal. MFUNC is a multifunction terminal whose function is selected via the multifunction
select register:
Bits 2−0
Function
000 General-purpose input/output (GPIO)
001 CYCLEIN
010 CYCLEOUT
011 PCI_CLKRUN
100−111 Reserved
PCI_RST 6 E02 I
PCI reset. When this bus reset is asserted, the TSB82AA2B device places all output buffers in a
high-impedance state and resets all internal registers except device power management context and
vendor-specific bits initialized by host power-on software. When PCI_RST is asserted, the device is
completely nonfunctional. This terminal must be connected to PCI bus RST
.
SCL 3 D02 I/O
Serial clock. This terminal provides the SCL serial clock signaling.
ROM is implemented: Connect terminal 3 to the SCL terminal on the ROM; the 2.7-kΩ resistor pulls
this signal to the ROM V
CC
. (SDA is implemented as open-drain.)
ROM is not implemented. Connect terminal 3 to ground with a 220-Ω resistor.
SDA 4 D01 I/O
Serial data. This terminal provides the SDA serial data signaling. This terminal is sampled at G_RST to
determine if a serial ROM is implemented; thus if no ROM is implemented, this terminal must be
connected to ground.
ROM is implemented: Connect terminal 4 to the SDA terminal on the ROM; the 2.7-kΩ resistor pulls
this signal to the ROM V
CC
. (SDA is implemented as open-drain.)
ROM is not implemented. Connect terminal 4 to ground with a 220-Ω resistor.