PXF4336 Datasheet, PDF (113/425 Pages) Infineon Technologies AG – ABM Premium ATM Buf fer Manager

ABM-P
PXF 4336 V1.1
Functional Description
3.5.2.2.5 RM_Cell_Update
In case of ABR-ER mode, this message is sent to inform the ABM-P core about the
results of the last ER calculation. If the emitted cell is an RM cell, the fields CI, NI, and
ER (if necessary) are updated. All other parameters are ignored.
3.5.2.3 ERC Mailbox
The ERC mailbox is used by an external micro-controller to communicate with the IOP
through the Microprocessor Interface. The micro-controller writes command messages
to the control and data registers which are evaluated by the IOP firmware. One control
bit initiates an interrupt to the IOP.
The usage of command and data fields is firmware implementation specific. A
handshake protocol is implemented in firmware to exchange information.
Note: The hardware does not determine the usage and interpretation of commands.
These are determined by firmware and must be known to the device driver
software.
Command List
The ERC mailbox is used, for instance, at system setup or setup of queues in order to
initialize appropriate variables of the IOP. The available commands use the following
parameters:
ConnTableWrite: Command=0x1
ConnTableRead: Command=0x2
ABMWriteRegister: Command=0x3
ABMReadRegister: Command=0x4
ExtdRAMWrite:
Command=0x5
ExtdRAMRead:
Command=0x6
InitIOP:
Command=0x7
CacheVarWrite: Command=0x8
CacheVarRead: Command=0x9
WriteIOPRegister: Command=0xA
ReadIOPRegister: Command=0xB
Commands are transferred via Register "ERC MailBox Register 0" on Page 335. In
case of read or write operations Register ERCMB1 transfers the address to the IOP
while ERCMB2 transfers the data word.
Note: For ERC unit configuration, only the commands InitIOP, CacheVarWrite and
CacheVarRead are relevant.
Data Sheet
113
2001-12-17