How many chip-selects does the MCF5445x have (6 or 4)?

M_H_ — Thu, 03 Jan 2008 19:49:08 GMT

According to 19.1.1 in the MCF54455 Reference Manual (Rev 2) the part has 6 chip selects (FB_CS[5:0]) and it provides details on the six chip-select address registers and six chip-select mask registers in 19.3.1 and 19.3.2 respectively. However, I can't find pin numbers for FB_CS4 and FB_CS5.

In the MCF5445x Microprocessor Data Sheet I can only find reference to FB_CS[3:0] so does it in fact only have 4 chip-selects or are FB_CS4 and FB_CS5 multiplexed with some other pins?

Re: How many chip-selects does the MCF5445x have (6 or 4)?

macl — Sat, 05 Jan 2008 04:04:02 GMT

Hi,

The MCF5445x FlexBus has 4 chip selects. Looks like the FlexBus module has up to 6, however only 4 where implemented on this device. Unfortunately some references to the 6 slipped into the reference manual. I've submitted a ticket to fix those errors in the next revision of the manual. Thank you very much for your feedback.

MacL

topic Re: How many chip-selects does the MCF5445x have (6 or 4)? in ColdFire/68K Microcontrollers and Processors

How many chip-selects does the MCF5445x have (6 or 4)?

Re: How many chip-selects does the MCF5445x have (6 or 4)?