QG80331M667 datasheet(25/67 Pages) INTEL

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Specification Update

Intel® 80331 I/O Processor

Non-Core Errata

25.

Boundary scan multi-chip module implementation

Problem:

The 80331 is not BSDL-compliant for the SAMPLE and BYPASS instructions specified by the

JTAG specification 1149.1. It is compliant for most board-level testing. When boards are tested for

opens and shorts, the 80331 BSDL can define the boundary scan length as +1 to encompass the

BYPASS register in the Intel XScale® core (therefore not visible).

Implication:

When doing ID, SAMPLE, or BYPASS, the Intel XScale® core BYPASS register makes the path

from TDI to TDO one flop longer than the specification requires, which could cause canned

software to error.

Note:

When neither of these are used by the board vendors during manufacturing testing, there is no issue.

Workaround:

Intel can provide two BSDL files which allow opens and shorts testing, as long as it does not test

the ID and BYPASS instructions. One covers the Intel XScale

® core unit and the other one for the

I/O processor, with the exception that both instruction sets are reduced from 14 to 7, since they are

operating independently.

Status:

No Fix. Not to be fixed. See the Table , “Summary Table of Changes” on page 9.

26.

Auto refresh command also generates a Precharge All command on DDR

bus

Problem:

When an auto refresh command is issued to the MCU SDRAM Initialization Register (write 0x6 to

SDIR) the hardware state machine executes a precharge all command and then an auto refresh

command.

Implication:

Some DIMMs may fail to initialize.

Workaround:

There is no way to decouple the precharge all and auto refresh commands in the MCU. However,

the DCAL can issue an auto refresh command, which can be used instead to issue the auto refresh

for initialization.

For both DDRI and DDRII initialization sequences, there are two back-to-back AutoRefresh

(ARF) commands issued to the DIMM (accomplished by writing 0x6 to MCU_SDIR

0xFFFF_E500 twice). This sequence is replaced by writing to the DCAL Control and Status

writes to the DCALSR as opposed to the previous two writes to MCU_SDIR. The exact address

and data values are as follows:

ADDRESS

WRITE_DATA

NOTE

0xFFFF_F500 0x8000_0001 -- ARF to CS[0]

0xFFFF_F500 0x8010_0001 -- ARF to CS[1]

Status:

No Fix. Not to be fixed. See the Table , “Summary Table of Changes” on page 9.

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