PI7C9X7958ANBE Pericom Semiconductor, PI7C9X7958ANBE Datasheet - Page 19

• Manufacturer Part Number: PI7C9X7958ANBE
• Description: IC PCIE-TO-UART BRIDGE 160LFBGA
• Manufacturer: Pericom Semiconductor

Specifications of PI7C9X7958ANBE

• Applications: PCIe-to-Uart Bridge
• Interface: Advanced Configuration Power Interface (ACPI)
• Voltage - Supply: 1.8V, 3.3V
• Package / Case: 160-LFBGA
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

11-0039
The receiver writes data to the bottom of the RHR when it finishes receiving and decoding the data bits. If
the RHR is full when the receiver attempts to write data to it, a data overrun occurs. Any read operation to
an empty RHR is invalid.
The empty and full status of the THR and RHR can be determined by reading the empty and full flags in
the Line Status Register (LSR). When the transmitter and receiver are ready to transfer data to and from the
FIFOs, interrupts are raised to signal this condition. Additionally, the user can use the Receive FIFO Data
Counter (RFDC) and Transmit FIFO Data Counter (TFDC) registers to determine the number of items in
each FIFO.
March 2011 – Revision 1.4
Pericom Semiconductor
WP
RP
Figure 5-1 Transmit and Receive FIFOs
RHR
DATA125
DATA126
DATA127
DATA0
DATA1
DATA2
PCI EXPRESS MASTER
UART COMMON MODE
Page 19 of 71
LSR
ADDRESS
LSR125
LSR126
LSR127
LSR0
LSR1
LSR2
THR
DATA125
DATA126
DATA127
DATA0
DATA1
DATA2
WP
RP
PCI Express® Octal UART
PI7C9X7958
Datasheet