MPC8280 datasheet(1277/1386 Pages) FREESCALE

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FCC HDLC Controller

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

37-15

Table 37-9 describes FCCE/FCCM fields.

Figure 37-8 shows interrupts that can be generated in the HDLC protocol.

Table 37-9. FCCE/FCCM Field Descriptions

Bits

Name

Description

0–7

—

Reserved, should be cleared.

GRA

Graceful stop complete. A graceful stop, which was initiated by the GRACEFUL STOP TRANSMIT

command, is now complete. GRA is set as soon as the transmitter finishes transmitting any frame

that is in progress when the command was issued. It is set immediately if no frame is in progress

when the command is issued.

9–10

—

Reserved, should be cleared.

TXE

Tx error. An error (CTS lost or underrun) occurs on the transmitter channel. This event is not

maskable via the TxBD[I] bit.

RXF

Rx frame. A complete frame is received on the HDLC channel. This bit is set no sooner than two

clocks after receipt of the last bit of the closing flag.

BSY

Busy condition. A frame is received and discarded due to a lack of buffers.

TXB

Transmit buffer. Enabled by setting TxBD[I]. A buffer is sent on the HDLC channel. TXB is set no

sooner than when the last bit of the closing flag begins its transmission if the buffer is the last one

in the frame. Otherwise, TXB is set after the last byte of the buffer is written to the transmit FIFO

buffer.

RXB

Receive buffer. When RXB = 1, a buffer for which the I bit is set in the corresponding BD was filled,

regardless if the end of a frame was completed in it.

16–21

—

Reserved, should be cleared.

FLG

Flag status changed. The HDLC controller stops or starts receiving HDLC flags. The real-time status

can be obtained in FCCS; see Section 37.10, “FCC Status Register (FCCS).”

IDL

Idle sequence status changed. A change in the status of the serial line is detected on the HDLC line.

The real-time status can be read in FCCS; see Section 37.10, “FCC Status Register (FCCS).”

24–31

—

Reserved, should be cleared.

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