PXF4336 Datasheet, PDF (110/425 Pages) Infineon Technologies AG – ABM Premium ATM Buf fer Manager

ABM-P
PXF 4336 V1.1
Functional Description
3.5.2 ERC Unit Functional Overview
Figure 3-47 provides an overview of the ERC unit of the ABM-P:
ext. Context
RAM
RAM
Code RAM
Processor
Message
Interface
AVT
(Context RAM)
SCAN
ABM-P
Core
Mailbox
SPI
(shared) uP-IF
ext. EEPROM
Figure 3-47 ERC Unit
The central function blocks of the ERC sub-system are the processor running the ABR
state machines and the AVT context table storing all connection specific parameters.
The SCAN unit next to the AVT table enforces all time-out related parameters by
generating time-out notifications. During initialization, the Code RAM is loaded via the
SPI Interface from an external serial EEPROM device. This firmware is needed for ABR
ER and ABR VS/VD. Communication with the ABM-P core (RM cell insert/extract, queue
information, rate update messages, cell emit events) is handled by the message
interface. The ERC sub-system shares the Microprocessor Interface with the ABM-P
core. Communication with an external microprocessor (e.g. extended Context RAM
access) is performed via a mailbox while access to the main context table AVT is done
directly by the microprocessor through dedicated transfer registers.
Data Sheet
110
2001-12-17