COREAI-AR datasheet(18/25 Pages) ACTEL

18 / 25 page

CoreAI

v2.0

ACM Interface

The ACM interface is used to configure the analog quads

and RTC within the AB macro. Various features of the

analog quads need to be set prior to correct operation of

the ADC, including the pre-scaler circuits in each of the

AV, AC, and AT analog input ports that will be accessed

in the user’s design. The SmartGen software, included

with Libero IDE, can be used to configure the various

pre-scaler settings for each quad, as well as the functions

used (voltage monitor, current monitor, temperature

monitor, gate-driver output driver strengths, etc.).

Consult the Fusion datasheet for details on how each

pre-scaler should be set, relative to the design-specific

voltage, current, or temperature ranges used.

The internal address map of the ACM is shown in

Table 32.

Note that the ACM must operate with a clock frequency

that is less than or equal to 10 MHz; to achieve this

requirement,

the

user

must

set

the

clock-divider

appropriately via the ACM_CLK_DIV parameter/generic.

For example, if the system clock frequency (PCLK) is

50 MHz, ACM_CLK_DIV can be set to 3, which would

generate an ACM clock frequency of 50/(23) = 6.25 MHz.

ACM reads and writes are synchronized to the internally

generated ACM clock. Since the ACM clock is operating

at a lower frequency than the system clock (PCLK) used

by CoreAI, various status and interrupt status registers

have been implemented to indicate when ACM read and

write accesses are busy or completed (see Table 10 on

page 12 and Table 30 on page 17).

Table 32 • ACM Address Map (Analog Quads and RTC)*

PADDR[4:0]

Name

Description

Associated Peripheral

0x00

–

Reserved

Unused

Analog Quad 0

0x01

AQ0

Byte 0 (AV0 control)

Analog Quad

0x02

AQ0

Byte 1 (AC0 control)

Analog Quad

0x03

AQ0

Byte 2 (AG0 control)

Analog Quad

0x04

AQ0

Byte 3 (AT0 control)

Analog Quad

Analog Quad 1

0x05

AQ1

Byte 0 (AV1 control)

Analog Quad

0x06

AQ1

Byte 1 (AC1 control)

Analog Quad

0x07

AQ1

Byte 2 (AG1 control)

Analog Quad

0x08

AQ1

Byte 3 (AT1 control)

Analog Quad

…

Analog Quad

Analog Quad 9

0x25

AQ9

Byte 0 (AV9 control)

Analog Quad

0x26

AQ9

Byte 2 (AC9 control)

Analog Quad

0x27

AQ9

Byte 2 (AG9 control)

Analog Quad

0x28

AQ9

Byte 3 (AT9 control)

Analog Quad

0x29

–

Reserved

Unused

0x30

–

Reserved

Unused

…

Unused

0x3E

–

Reserved

Unused

Note: *Address values are given in hexadecimal format.

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