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RELEASED
DATA SHEET
PM7366 FREEDM-8
ISSUE 4
PMC-1970930
FRAME ENGINE AND DATA LINK MANAGER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
82
TDQFE:
The transmit packet descriptor free queue write interrupt enable bit (TDQFE) enables transmit
packet descriptor free queue write interrupts to the PCI host. When TDQFE is set high,
writing a programmable number of TDRs to the TDR Free Queue will cause an interrupt to be
generated on the PCIINTB output. Interrupts are masked when TDQFE is set low. However,
the TDQFI bit remains valid when interrupts are disabled and may be polled to detect TDR
free queue write events.
TDQRDYE:
The transmit descriptor ready queue cache read interrupt enable bit (TDQRDYE) enables
transmit descriptor ready queue cache read interrupts to the PCI host. When TDQRDYE is
set high, reading a programmable number of TDRs from the TDR Ready Queue will cause an
interrupt to be generated on the PCIINTB output. Interrupts are masked when TDQRDYE is
set low. However, the TDQRDYI bit remains valid when interrupts are disabled and may be
polled to detect TDR ready queue cache read events.
TDFQEE:
The transmit descriptor free queue error interrupt enable bit (TDFQEE) enables transmit
descriptor free queue error interrupts to the PCI host. When TDFQEE is set high, attempting
to write to the transmit free queue while the queue is full will cause an interrupt to be
generated on the PCIINTB output. Interrupts are masked when TDFQEE is set low.
However, the TDFQEI bit remains valid when interrupts are disabled and may be polled to
detect TD free queue error events.
IOCE:
The transmit interrupt on complete enable bit (IOCE) enables transmission complete
interrupts to the PCI host. When IOCE is set high, complete transmission of a packet with the
IOC bit in the TD set high will cause an interrupt to be generated on the PCIINTB output.
Interrupts are masked when IOCE is set low. However, the IOCI bit remains valid when
interrupts are disabled and may be polled to detect transmission of IOC tagged packets.
TFUDRE:
The transmit FIFO underflow error interrupt enable bit (TFUDRE) enables transmit FIFO
underflow error interrupts to the PCI host. When TFUDRE is set high, attempts to read data
from the logical FIFO when it is already empty will cause an interrupt to be generated on the
PCIINTB output. Interrupts are masked when TFUDRE is set low. However, the TFUDRI bit
remains valid when interrupts are disabled and may be polled to detect transmit FIFO
underflow events.