Avago Technologies PEX 8605 - Manual (Page 8)

PEX8605
© PLX Technology, www.plxtech.com Page 8 of 13 2 May 2013, version 1.7
2.9 JTAG Interface – 5 Pins
Signal
Name Dual-
Row
QFN
Pkg.
Pin # TQFP
Package
Pin # Signal
Type Checked Recommendations
JTAG_TCK A48 94
I
PU
YES
NO
UNKNOWN
JTAG Test Clock Input
Frequency can be from 0 to 10 MHz.
This signal is internally pulled up to VDD2.5 through a weak
pull-up resistor. If this pin is connected to external board
circuits, an external pull-up is also recommended.
JTAG_TDI A47 91
I
PU
YES
NO
UNKNOWN
JTAG Test Data Input
This signal is internally pulled up to VDD2.5 through a weak
pull-up resistor. If this pin is connected to external board
circuits, an external pull-up is also recommended.
JTAG_TDO B29 65 O
YES
NO
UNKNOWN
JTAG Test Data Output
Serial output from the JTAG TAP Controller test instructions
and data. Can be left open (no connect) if JTAG interface is
not used.
JTAG_TMS B42 95
I
PU
YES
NO
UNKNOWN
JTAG Test Mode Select
This signal is internally pulled up to VDD2.5 through a weak
pull-up resistor. If this pin is connected to external board
circuits, an external pull-up is also recommended.
JTAG_TRST# A34 66
I
PU
YES
NO
UNKNOWN
JTAG Test Reset
Pull to GROUND (VSS) through 1.5K ohms for normal
operation
2.10 I²C Slave Interface Signals – 5 Pins
Signal Name Dual-Row
QFN Pkg.
Pin #
TQFP
Package
Pin # Signal
Type Checked Recommendations
I2C_ADDR[2:0] A41, B36,
A42
80, 81, 82
I
PU
YES
NO
UNKNOWN
I²C Slave Address Bits 2 through 0 (3 Pins)
Used to configure the device address on the I²C Bus. If I²C or
PEX_INTA# output is used, I2C_ADDR[2:0] should be
strapped to a unique address, to avoid address conflict with
any other I²C devices (on the same I²C Bus segment) that have
the upper four bits of their 7-bit I²C Slave address also Set to
1011b. Must be pulled High to VDD25 or Low to VSS (GND)
through external resistors.
I2C_SCL A45 87 OD
YES
NO
UNKNOWN
I²C Serial Clock
I²C Clock source. This signal must be pulled high to VDD_IO.
Refer to the I2C specification for details.
I2C_SDA0
B39
88 OD
YES
NO
UNKNOWN
I²C Serial Data
Transfers and receives I²C data. This signal must be pulled
high to VDD_IO. Refer to the I2C specification for details.