Rainbow Electronics DS26519 - Manual (Page 86)

DS26519 16-Port T1/E1/J1 Transceiver
86 of 310
Figure 9-18. HDLC Message Receive Example
Reset Receive
HDLC Controller
(RHC.6)
Configure Receive
HDLC Controller
(RHC, RHBSE, RHFC)
Start New
Message Buffer
Enable Interrupts
RPE and RHWM
Start New
Message Buffer
Interrupt?
Read Register
RHPBA
Read N Bytes From
Rx HDLC FIFO (RHF)
N = RHPBA[5..0]
MS = 1?
(MS = RHPBA[7])
NO
YES
NO
YES
Read RRTS5 for
Packet Status (PS2..0)
Take appropriate action
No Action Required
Work Another Process.
Read N Bytes From
Rx HDLC FIFO (RHF)
N = RHPBA[5..0]
Start New
Message Buffer
Start New
Message Buffer