COM90C66 Datasheet, PDF (65/76 Pages) SMSC Corporation – ARCNET Controller/Transceiver with AT Interface and On-Chip RAM

DATA SHEET ERRATA FOR REVISION D COM90C66
PAGE
2,6,13
25
SECTION/FIGURE/ENTRY
CORRECTION
Pin Configuration - Pin 60; In Revisin D, Pin 60 is not a No Connect, but
Description of Pin Functions - Pin 60; rather, "n16-Bit Detect". The symbol is
Figure 2 - System Block Diagram - "n16DETECT", and the Description should read
Pin 60
"Input. When this signal is low any time
between hardware reset and writing to the
Configuration Register, the device defaults to 16-
bit Mode. If a logic "0" is not sensed, the device
defaults to 8-bit Mode. The default setting
obtained as a result of this input may be
overridden via software. This signal is
connected to a weak internal pull-up resistor. For
a board designed to support both 8- and 16-bit
buses, it is recommended that this signal be
connected to a signal which is low only in the
presence of a 16-bit bus, such as connector D18
of the AT bus (AT ground)."
Table 8 - Configuration Register - Bit The last sentence in the Description should read
7
"This bit defaults to a logic "1" (16-bit mode) if
Pin 60 senses a low level any time between
hardware reset and the writing of the
Configuration Register. If a logic "0" is not
sensed, bit 7 defaults to a logic "0" (8-bit mode).
Writing to the Configuration Register overrides
the bus-size default determined by Pin 60."
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