CDPD Wireless Modem Data Pump
FX949
1.5
General Description
This device performs most of the Medium Access Control (MAC) layer functions of the CDPD
specification as well as generation of the baseband signals in the physical layer, all of which are
specifically for the Mobile End Station (M-ES). For details of the system requirements and telegram
formats, the user is referred to "Cellular Digital Packet Data System Specification", Volumes 1 to 5,
currently available from:
CDPD Forum Inc.
PO Box 809320
Chicago, IL 60686
United States of America
1.5.1
Software Description
From the programmer's viewpoint, the FX949 interface consists of a number of registers, addressable
from a 7-bit bus with data supplied on a standard 8-bit
µ
P bus, as shown in Figure 4.
Read Only Registers
A0 - A6
HEX
ADDRES
S
$00
$01
$02
|
|
|
|
$3C
$3D
$3E
$3F
$40
$41
$42
$43
$44
$45
$46
$47
$48
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
RDN
WRN
CSN
REGISTER
NAME
BIT 7
(D7)
BIT 6
(D6)
BIT 5
(D5)
BIT 4
(D4)
BIT 3
(D3)
BIT 2
(D2)
BIT 1
(D1)
BIT 0
(D0)
0
0
0
1
1
1
0
0
0
RX DATA 0
RX DATA 1
RX DATA 2
|
|
|
|
RX DATA 60
RX DATA 61
RX DATA 62
RX SYN 1
RX SYN 2
RX SYN 3
RX SYN 4
RX SYN 5
RX SYN 6
RX SYN 7
RX SYN 8
RX SYN 9
RX SYN 10
0
0
0
0
0
0
<-------------------- DATA SYMBOL 0 ------------------>
<-------------------- DATA SYMBOL 1 ------------------>
<-------------------- DATA SYMBOL 2 ------------------>
|
|
|
|
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
<------------------ DATA SYMBOL 60 ------------------->
<------------------ DATA SYMBOL 61 ------------------->
<------------------ DATA SYMBOL 62 ------------------->
<-- SYNDROME SYMBOL 1
>
<-- SYNDROME SYMBOL 2
>
<-- SYNDROME SYMBOL 3
>
<-- SYNDROME SYMBOL 4
>
<-- SYNDROME SYMBOL 5
>
<-- SYNDROME SYMBOL 6
>
<-- SYNDROME SYMBOL 7
>
<-- SYNDROME SYMBOL 8
>
<-- SYNDROME SYMBOL 9
>
= [ r (x) / (x +
α
1) ] ---
= [ r (x) / (x +
α
2) ] ---
= [ r (x) / (x +
α
3) ] ---
= [ r (x) / (x +
α
4) ] ---
= [ r (x) / (x +
α
5) ] ---
= [ r (x) / (x +
α
6) ] ---
= [ r (x) / (x +
α
7) ] ---
= [ r (x) / (x +
α
8) ] ---
= [ r (x) / (x +
α
9) ] ---
<-- SYNDROME SYMBOL 10 = [ r (x) / (x +
α
10) ] --
>
©
1996 Consumer Microcircuits Limited
9
D/949/5
CMLMICRO [ CML MICROCIRCUITS ]
