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Intel® 6400/6402 Advanced Memory Buffer Datasheet

Errors

6.1.2

DDR Errors

6.1.3

Host Protocol Errors

AMBs are not expected to detect bad protocol from the host.

Access to unimplemented register

If UNIMPLCFG error type enabled in EMASK Register

Drop Config Write cmds

Capture Addr in RECCFG register if not previously set

Return 0’s data if Config Read (or return -1 if Read addr to unimplemented

function - though currently expect all functions to be used)

UNIMPLCFG error type logged in FERR or NERR registers

Error/Alert Asserted bit set in FBD Status 0 register

Else ignore error

NOTE: The timing of the Error/Alert Asserted bit in FBD Status 0 response for an

unimplemented register is not guaranteed relative to the corresponding Sync/Status

boundaries. For example, if an unimplemented register access occurs in the frame

before a Sync frame, the Error Asserted bit in FBD Status 0 may not be asserted in

northbound Status corresponding to that Sync. But it will be asserted in a later

Status response.

Undefined command

Undefined commands with good CRC are ignored. This is not considered an error

condition, and is not logged. Treat as reserved command or Channel NOP

TID error on config writes

If the TID bit on a config write matches the value of the previous TID bit, the write

is ignored. The TID bit stored in the AMB is left unchanged in this case.

This error does not cause an alert frame, and is not logged.

The purpose of the TID bit is to allow the host to retry a config write command

following a fast reset if it does not know if it had been executed prior to an alert. If

the config write had occurred the TID bit will be the same, the retried write will be

ignored. If it had not occurred, the TID bit will be opposite, and the retried write to

will be executed.

Table 6-3.

DDR Errors

Error

Response

Failure of software to achieve calibration

This is detected through firmware during the calibration routine.

Firmware should treat the DIMM as a repeater if it is an intermediate DIMM or map

it out if it is the last DIMM in the chain

DDR voltage does not power up

if normal FBD interface comes up, should at least act like a repeater. Does not bring

down FBD channel - like above. DDR cmds directed at DIMM will fail to return valid

responses.

Table 6-2.

Link Errors in Normal Operation (Sheet 2 of 2)

Error

Response

Table 6-4.

Host Protocol Errors

Error

Response

Illegal combinations of commands

• see Concurrent Command Delivery

Rules section of the FBD Architecture

and Protocol Specification

AMB response to illegal command combinations is undefined

Commands to multiple AMBs to return

data in the same return frame.

If multiple AMBs attempt to return data in the same frame, the host will see the

data from the northern most AMB which is providing data, as it will replace any data

sent from AMBs to its south. A host controller should not produce commands which

would cause multiple AMBs to respond with data in the same frame. A special case

can occur where Alert frames are being sent by one or more AMBs while another

AMB is returning data from a command. These cases are discussed in the

Architecture and Protocol spec in the Northbound Alert Frame section.

6402 Datasheet(PDF) 73 Page - Intel Corporation

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