PI7C9X7954AFDE Pericom Semiconductor, PI7C9X7954AFDE Datasheet - Page 13

• Manufacturer Part Number: PI7C9X7954AFDE
• Description: IC PCIE-TO-UART BRIDGE 128LQFP
• Manufacturer: Pericom Semiconductor

Specifications of PI7C9X7954AFDE

• Applications: PCIe-to-Uart Bridge
• Interface: Advanced Configuration Power Interface (ACPI)
• Voltage - Supply: 1.8V, 3.3V
• Package / Case: 128-LQFP
• Mounting Type: Surface Mount
• Transmitter And Receiver Fifo Counter: Yes
• Package Type: LQFP
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.2.2.
4.2.3.
September 2009 – Revision 1.3
Pericom Semiconductor
PCI EXPRESS INTERFACE
SYSTEM INTERFACE
PIN NO.
*58, *57,
*56, *55
62, 61, 60,
59
68, 67, 66,
65
PIN NO.
23, 22
26, 28
16, 18
29
PIN NO.
36
NAME
DRIVER_SEL1
[3:0]
DRIVER_SEL2
[3:0]
DRIVER_SEL3
[3:0]
NAME
TXP, TXN
RXP, RXN
CLKINP,
CLKINN
RREF
NAME
PEREST_L
09-0088
TYPE
TYPE
TYPE
O
O
O
O
I
I
I
I
Page 13 of 70
DESCRIPTION
DRIVER_SEL1: Used to select RS-232/ RS-424/ 4-Wire RS-485/
2-Wire RS-458 Serial Port Mode for UART 1. DRIVER_SEL1 [3:0]
are output signals with weak internal pull-down resistors.
Driver Equalization Level Control (DEQ[0]): During system
initialization, DRIVER_SEL1[3] acts as the DEQ[0] pin, and it is
used to control the driver current level. By default, it is set to ‘0’
without pin strapped.
Driver Current Level Control (DTX[3:1]): During system
initialization, DRIVER_SEL1[2:0] acts as the DTX[3:1] pins, and
they are used to control the driver current level. By default, they are
set to ‘000’ without pin strapped.
DRIVER_SEL2: Used to select RS-232/ RS-424/ 4-Wire RS-485/
2-Wire RS-458 Serial Port Mode for UART 2. DRIVER_SEL2[3] is
an output signal with a weak internal pull-up resistor, and other
DRIVER_SEL2 signals are output signals with internal pull-down
resistors.
DRIVER_SEL3: Used to select RS-232/ RS-424/ 4-Wire RS-485/
2-Wire RS-458 Serial Port Mode for UART 3. DRIVER_SEL3 [3:0]
are output signals with weak internal pull-up resistors.
DESCRIPTION
PCI Express Serial Output Signal: Differential PCI Express
output signals.
PCI Express Serial Input Signal: Differential PCI Express input
signals.
Reference Input Clock: Connects to external 100MHz differential
clock
The input clock signals must be delivered to the clock buffer cell
through an AC-coupled interface so that only the AC information of
the clock is received, converted, and buffered. It is recommended
that a 0.1uF be used in the AC-coupling.
Reference Resistor: To accurately set internal bias references, a
precision resistor must be connected between Rref and Vss. The
resistor should have a nominal value of 2.1 KΩ and accuracy of +/-
1%
DESCRIPTION
System Reset Input
PCI Express® Quad UART
PI7C9X7954
Datasheet