*Notice: The information in this document is subject to change without notice
July 1, 2009
Advance Information
MSMBCLK
MSMBDAT
IDT 89HPES16T4BG2 Data Sheet
Pin Description
The following tables list the functions of the pins provided on the PES16T4BG2. Some of the functions listed may be multiplexed onto the same
pin. The active polarity of a signal is defined using a suffix. Signals ending with an “N” are defined as being active, or asserted, when at a logic zero
(low) level. All other signals (including clocks, buses, and select lines) will be interpreted as being active, or asserted, when at a logic one (high) level.
Note:
In the PES16T4BG2, the three downstream ports are labeled port 2, port 4, and port 6.
Signal
PE0RP[3:0]
PE0RN[3:0]
PE0TP[3:0]
PE0TN[3:0]
PE2RP[3:0]
PE2RN[3:0]
PE2TP[3:0]
PE2TN[3:0]
PE4RP[3:0]
PE4RN[3:0]
PE4TP[3:0]
PE4TN[3:0]
PE6RP[3:0]
PE6RN[3:0]
PE6TP[3:0]
PE6TN[3:0]
PEREFCLKP[0]
PEREFCLKN[0]
Type
I
O
I
O
I
O
I
O
I
Name/Description
PCI Express Port 0 Serial Data Receive.
Differential PCI Express receive
pairs for port 0. Port 0 is the upstream port.
PCI Express Port 0 Serial Data Transmit.
Differential PCI Express trans-
mit pairs for port 0. Port 0 is the upstream port.
PCI Express Port 2 Serial Data Receive.
Differential PCI Express receive
pairs for port 2.
PCI Express Port 4 Serial Data Receive.
Differential PCI Express receive
pairs for port 4.
PCI Express Port 4 Serial Data Transmit.
Differential PCI Express trans-
mit pairs for port 4.
PCI Express Port 6 Serial Data Receive.
Differential PCI Express receive
pairs for port 6.
PCI Express Port 6 Serial Data Transmit.
Differential PCI Express trans-
mit pairs for port 6.
PCI Express Reference Clock.
Differential reference clock pair input. This
clock is used as the reference clock by on-chip PLLs to generate the clocks
required for the system logic and on-chip SerDes. The frequency of the dif-
ferential reference clock is determined by the REFCLKM signal.
PCI Express Reference Clock Mode Select.
This signal selects the fre-
quency of the reference clock input.
0x0 - 100 MHz
0x1 - 125 MHz
This pin should be static and not change following the negation of
PERSTN.
Table 2 PCI Express Interface Pins
REFCLKM
I
Signal
MSMBADDR[4:1]
MSMBCLK
MSMBDAT
Type
I
I/O
I/O
Name/Description
Master SMBus Address.
These pins determine the SMBus address of the
serial EEPROM from which configuration information is loaded.
Master SMBus Clock.
This bidirectional signal is used to synchronize
transfers on the master SMBus.
Master SMBus Data.
This bidirectional signal is used for data on the mas-
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