PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 195

• Manufacturer Part Number: PEB2085
• Description: ISDN SubscribernAccess Controller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

4
The parameterization of the ISAC-S and the transfer of data and control information between
the P and ISAC-S is performed through two register sets.
The register set in the address range 00-2B
controller. It includes the two FIFOs having an identical address range from 00-1F
The register set ranging from 30-3B
interface. Since the meaning of most register bits depends on the selected IOM mode (IOM-1
or IOM-2), the description of this register set is divided into two sections:
The address map and a register summary are shown in the following tables:
Table 20
ISAC
Address
(hex)
00
.
.
1F
20
21
22
23
24
25
26
27
28
29
2A
2B
Semiconductor Group
4.2 Special Purpose Registers: IOM-1 Mode
4.3 Special Purpose Registers: IOM-2 Mode
®
-S Address Map 00-2B
Detailed Register Description
Read
Name
RFIFO
ISTA
STAR
MODE
TIMR
EXIR
RBCL
SAPR
RSTA
RHCR
RBCH
STAR2 Status Register 2
Description
Receive FIFO
Interrupt Status Register
Status Register
Mode Register
Timer Register
Extended Interrupt
Register
Receive Frame Byte Count
Low
Received SAPI
Receive Status Register
Receive HDLC Control
Receive Frame Byte Count
High
H
H
pertains to the control of layer-1 functions and of the IOM
195
H
pertains to the HDLC transceiver and LAPD
Write
Name
XFIFO
MASK
CMDR
XAD1
XAD2
SAP1
SAP2
TEI1
TEI2
Description
Transmit FIFO
Mask Register
Command Register
Transmit Address 1
Transmit Address 2
Individual SAPI 1
Individual SAPI 2
Individual TEI 1
Individual TEI 2
Register Description
H
.