AFS090 datasheet(67/334 Pages) MICROSEMI

67 / 334 page

Fusion Family of Mixed Signal FPGAs

R e visio n 2

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The following error indications are possible for Read operations:

1. STATUS = '01' when a single-bit data error was detected and corrected within the block

addressed.

2. STATUS = '10' when a double-bit error was detected in the block addressed (note that the error is

uncorrected).

In addition to data reads, users can read the status of any page in the FB by asserting PAGESTATUS

along with REN. The format of the data returned by a page status read is shown in Table 2-23, and the

definition of the page status bits is shown in Table 2-24.

Table 2-23 • Page Status Read Data Format

Write Count Reserved Over Threshold Read Protected

Write Protected

Overwrite Protected

Table 2-24 • Page Status Bit Definition

Page Status

Bit(s)

Definition

31–8

The number of times the page addressed has been programmed/erased

7–4

Reserved; read as 0

Over Threshold indicator (see the"Program Operation" section on page 2-48)

Read Protected; read protect bit for page, which is set via the JTAG interface and

only affects JTAG operations. This bit can be overridden by using the correct user

key value.

Write Protected; write protect bit for page, which is set via the JTAG interface and

only affects JTAG operations. This bit can be overridden by using the correct user

key value.

Overwrite Protected; designates that the user has set the OVERWRITEPROTECT

bit on the interface while doing a Program operation. The page cannot be written

without first performing an Unprotect Page operation.

AFS090 Datasheet(PDF) 67 Page - Microsemi Corporation