RM0345 datasheet(24/38 Pages) STMICROELECTRONICS

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Calibration software compatibility and configuration

RM0345

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Doc ID 024080 Rev 3

9.1.3

Cal Bus EBI Settings

For using the calibration bus with an external memory the user must configure the bus for

multiplexed operation. These settings are located in two registers:

–

EBI Module Configuration Register (EBI_MCR)

–

EBI Calibration Base Register (EBI_CAL_BRx)

–

EBI Calibration Option Register (EBI_CAL_ORx)

The EBI Module Configuration Register contains bits which configure various attributes

associated with EBI operation. In the EBI_MCR register, the D16_31, AD_MUX and DBM

fields need to be configured.

In the EBI_CAL_BRx register there are few fields that need to be configured, these are

detailed in the Table 14 .

Table 13.

EBI_MCR register setting

bit

field

Name

Description

value

D16_31

Data Bus 16_31 Select

The D16_31 bit controls whether the EBI uses the

DATA[0:15] or DATA[16:31] signals, when in 16-bit Data

Bus Mode (DBM=1) or for chip-select accesses to a 16-

bit port (PS=1).

0b0

1 = DATA[16:31] signals are used for 16-bit port accesses

0 = DATA[0:15] signals are used for 16-bit port accesses

AD_MUX

Address on Data Bus

Multiplexing Mode

The AD_MUX bit controls whether non-chip-select

accesses have the address driven on (or sampled from

for external master transfers) the data bus in the address

phase of a cycle.

0b1

1 = Address on Data Multiplexing Mode is used for non-

CS accesses.

0 = Only Data on data pins for non-CS accesses.

DBM

Data Bus Mode

The DBM bit controls whether the EBI is in 32-bit or 16-bit

Data Bus Mode.

0b1

1 = 16-bit Data Bus Mode is used

0 = 32-bit Data Bus Mode is used

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