pt7a6527 Pericom Technology Inc, pt7a6527 Datasheet - Page 24

• Manufacturer Part Number: pt7a6527
• Description: Hdlc Controller
• Manufacturer: Pericom Technology Inc

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Figure 22 Transmission of an HDLC Frame
Table 10 Possible Interrupt Causes and Reactions
Mnemonic
RPF
RME
RFO
XPR
XDU
Table 11 List of Commands
PT0080(02/09)
Command
Mnemonic
F_XHFC
F_XHF
RMCD
XHFC
XRES
RRES
RMC
XHF
Meaning
Receive Pool
Full
Receive Message
End
Receive Frame
Overflow
Transmit Pool
Ready
Transmit Data
Under-run
Hex
0A
0C
0E
80
40
20
08
01
t
Bit 7- Bit 0
1000 0000
0100 0000
0010 0000
0000 1000
0000 1010
0000 1100
0000 1110
0000 0001
Transmitter
PT7A6527
Reaction
Read 32 bytes from RFIFO and acknowledge with RMC.
Read “RFBC4-0” bytes from RFIFO and acknowledge with RMC.
Error report for statistical purposes (loss of a complete frame). Probable cause: deficiency in
software.
Write data bytes in the XFIFO if the frame currently being transmitted is not finished or a
new frame is to be transmitted, and issue an XHF (and possible XME) command.
Acknowledged by a read of the ISTA. Possible causes: Excessive software reaction times, or
transmit data collision.
HDLC
Receive Message Complete. Acknowledges a block (RPF) or a frame (RME) stored
in the RFIFO.
Reset HDLC Receiver. The RFIFO is cleared and the receiver is ready for reception
Receiver Message Delete. The part of the frame in the RFIFO is deleted and the rest
of the frame will be ignored by the receiver.
Transmit HDLC Frame. Enables the transmission of the block entered last into the
XFIFO. The frame is not yet complete
Transmit a HDLC Frame and close it with CRC and flag
Same as preceding, but used in master mode to enforce a transmission even in the
case of a collision.
Reset Transmitter. Clears the XFIFO; any frame currently being transmitted is
aborted.
(Transmission of Remainder plus CRC plus Flag)
Data Transfer
(Transmission of Flag plus 32 Bytes)
(Transmission of 32 Bytes)
XHF-XME
24
XPR
XHF
XPR
XHF
XPR
XHF
XPR
XPR
Meaning
System
uP
HDLC controller
Data Sheet
PT7A6527
Ver:4