28560-PBD-001-A_15 Datasheet, PDF (1/2 Pages) M/A-COM Technology Solutions, Inc. – Product Bulletin

CX28560
Product Bulletin
Product Affected: CX28560-11P, 680-pin TBGA package (40 mm)
500335A
April 22, 2002
This document describes conditions that may cause the operation of the above device to
deviate from published specifications.
TSLP Channel Status Register Always Reads Zero
Description:
Reading of the TSLP channel status register for any channel (at address: 0x128800 + channel
number) always returns zero, regardless of the actual channel status.
Recommended Action:
Use the alternative method below to access the channel status:
1. Enable access to extended addresses by writing 1 to the direct access register at offset
0x10C84 (in dwords from the PCI base address)
2. Using the Service Request Mechanism, read the CX28560 register at address
0x12C000 + 4 * channel number.
! Look at the value of bits 14–16:
If the channel is active, bits 14–16 contain a value other than zero;
If the channel is inactive, bits 14–16 contain a value of zero.
3. Disable access to extended addresses as soon as possible by writing 0 to the direct access
register at offset 0x10C84 (in dwords from the PCI base address)
NOTE: When using the driver, the procedure outlined above is incorporated into the
MlCn856xGetTxChanStatus () function so that no code changes are required.
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