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MTC20136

The Ctrl-E physical interface between the mailbox and an external controller can be used in one of two

modes: as a dedicated serial bus interface or as a generic parallel bus interface. Selection between serial

and parallel mode is done with an external mode strap, IO pins are shared.

Ctrl-E Mailbox

The Ctrl-E Mailbox occupies a 512 byte memory map accessible by the Ctrl-E physical interface and by

the ASB bus. The mailbox memory map is given in Table 4.

An external interrupt can be generated by the Mailbox interrupt controller.

A full description of the CTRLE protocol and use of the CTRLE mailbox is available in the “CTRLE Inter-

face Specifications” documents, available separately.

Table 4. Ctrl-E controller memory map:

Field

Acc

Mailbox

Address MA[8:0]

Size(bit)

Initial

Function

TxCommand

RW

Command written by Ctrl-E, read by

ASB

RxCommand

RW

Command written by ASB, read by

Ctrl-E

TxComAv

RW

1-bit register : 1 if TX command

available

RxComAv

RW

1-bit register : 1 if RX command

available

Semaphore

PV

Semaphore for access to written by

ASB, read by Ctrl-E

CtrleDataBuffer

RW

507x8 bit data buffer