Customer Update
Readback Specification Established on XC4000/D/E
Xilinx is now officially establishing the readback specification of the
XC4000, XC4000D and XC4000E to be 1MHz-2MHz. The performance level for
the readback feature has never been officially specified, although it had
been described in a published application note to be 10KHz-1MHz (
XAPP 015.000 "Using the XC4000 Readback
Capability"). Establishing this specification improves performance of the
device and allows a higher performance of this powerful feature. Xilinx
believes that establishing this specification will adversely affect very
few users. However, for those that are affected, Xilinx can provide silicon
that meets 10KHz-1MHz operation. Contact your Xilinx sales representative
for more information.
Also, this change will require a software patch to the X-Checker accessory,
which will adjust its operating frequency to meet the new specification.
This patch is now on the Xilinx BBS (PC only) and FTP site. Versions are
available for the PC,
Sun
workstation, and HP
workstation. The existing X-Checker operation can be used, however a small
chance exists that the current X-Checker may register erroneous readback
errors. If readback errors are encountered, they are most likely indicative
of X-Checker operating outside of the specification range, and not a reflection
of the configuration data integrity. If you encounter a readback issue,
please contact your Xilinx sales representative
or the Xilinx hotline.
Updated specifications have been added to the XC4000
Series Data sheet. Trch and Trcl are the key parameters affected. This
affects only the XC4000 (including the "D") and XC4000E families, and not
the XC4000A, XC4000H, XC4000EX or any other Xilinx product families.
9/15/96 XCU 099601
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