MAC7200 datasheet(461/976 Pages) FREESCALE

461 / 976 page

Platform RAM Array Controller (PRAM_CTL)

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

383

differences in functionality between the 2.v6 spec and the PRAM implementation. Signals which are

exclusive to this block and not sufficiently described in Table 19-3 are further defined as well.

See Section 19.2.3.2, “Max Address,” for a more detailed description.

Table 19-4. Signal Property Details

Name

Description

htrans

A state of BUSY is not supported and furthermore is regarded as IDLE

01 IDLE - no transfer required

01 BUSY - not supported

01 NSEQ - first transfer of burst or single transfer

11 SEQL - burst transfer

pram_size

Supported power of 2 RAM array sizes are:

0111 32KB

1000 64KB

1001 128KB

1010 256KB

1011 512KB

1100 1024KB

pram_max_addr This input defines the maximum address of the attached memory array. This functionality allows

non-power-of-2 memories to be supported. See Section 19.2.3.2, “Max Address,” for a more detailed

description.

mcm_con_1bi

When asserted, one bit of write data is inverted continously on each active pram write cycle. This inserts

a single correctable error is inserted at these locations.

mcm_one_1bi

When asserted, one bit of write data is inverted, one time only, on the next active pram write cycle. This

inserts a single correctable error at this location.

mcm_con_nci

When asserted, one bit of write data is inverted continously on each active pram write cycle. In addition,

the overall parity bit associated with the active bank (pram_wdata_ecc[0]) is inverted. This inserts a

multiple bit non correctable error at these locations.

mcm_one_nci

When asserted, one bit of write data is inverted continously on each active pram write cycle. In addition,

the overall parity bit associated with the active bank (pram_wdata_ecc[0]) is inverted. This inserts a

multiple bit non correctable error at this location.

MAC7200 Datasheet(PDF) 461 Page - Freescale Semiconductor, Inc