SSCI HSS4NG, User Manual, Page: 24 / 34

Name Options Description
CCII/HSS8/6-MAN/004 2009-08-31 Issue 1.2
CH8MAN04.WPD
Page 16 of 26
Max. RX Bytes 1 to (16 384 - CRC bytes (two or four)) (default) Maximum number of bytes to receive
before closing buffer.
Set equal to max_frame_bytes.
Max. Frame Bytes
1 to 16 384 (default) Maxi mum n u m b e r o f b yt e s p er
frame. Set equal to the number of
data bytes plus the number of CRC
bytes (either two or four) per frame.
Address Mask 0x0000 - 0xFFFF HDLC address mask. A one enables
comparison and a zero masks it.
Address[4]
0x0000 - 0xFFFF Four address registers for address
recognition. The SCC reads the
frame address from the HDLC
receiver, compares it with the
address registers, and masks the
result with address_mask.
For example, to recognize a frame
that begins 0x7E (flag), 0x68, 0xAA,
using 16-bit address recognition, the
address registers should contain
0xAA68 and address_mask should
contain 0xFFFF. For 8-bit addresses,
clear the eight high-order address
bits.
Flags between Frames 0 - 15 Minimum number of flags between or
before frames.
Enable Retransmit
Enable re-transmit.
Enable Flag Sharing
Enable flag sharing.
Disable RX while TX Disable receive during transmit.
Enable Bus Mode
Enable bus mode.
Enable RTS Mode
Enable special RTS operation in
HDLC bus mode.
Enable Multiple Frames
Enable multiple frames in transmit
FIFO.
Encoding Method
NRZ
NRZI_MARK
NRZI_SPACE
FM0
FM1
MANCHESTER
DIFF_MANCHESTER RX / TX encoding method. NRZ and
NRZI use no DPLL. FM0/1,
Manchester and Diff_Manchester
use the DPLL for clock recovery.The
clock rate is 16x when the DPLL is
used.
Preamble Length
0
8
16
32
48
64
128 Determines the length of the
preamble pattern.
Pattern
00
10
01
11 Determines what bit pattern
precedes each TX frame.
Send flags/sync Send either idles or flags/syncs
between frames as defined by the
protocol. For HDLC the flag is
defined as 0x7E. NRZI encoding
methods may only be used with
flags/syncs.