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AM79C32AVC bảng dữ liệu(PDF) 11 Page - Advanced Micro Devices

tên linh kiện AM79C32AVC
Giải thích chi tiết về linh kiện  Digital Subscriber Controller??(DSC?? Circuit
PDF  101 Pages
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nhà sản xuất  AMD [Advanced Micro Devices]
Trang chủ  http://www.amd.com
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AM79C32AVC bảng dữ liệu(HTML) 11 Page - Advanced Micro Devices

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Am79C30A/32A Data Sheet
11
Bc buffers must be accessed within 122.4 µs. This is to
prevent erroneous data transfers. Only one interrupt is
used to signal accessibility for both B channels of the S
Interface. Since the data transfer must occur synchro-
nously to the S Interface, any data access to either Bb
or Bc or both must be made within the122.4 µs limit.
Note that even though only a single interrupt is issued,
either or both S-Interface B channels must be serviced.
IR bits 2, 3, 5, 6, and 7, if set, indicate that a bit has
been set in the associated status or error register. All of
the interrupts generated by the Am79C30A/32A can be
individually disabled. In the case of IR bit 7, the inter-
rupt can also be masked by setting PPIER bit 7 to 0.
DMR1, DMR2, DMR3, LMR2, MCR4, and MF control
the mask conditions that affect the INT pin. The INT pin
is activated only by interrupts that are not disabled. The
Interrupt Register reflects the status of enabled inter-
rupts. The INT pin can be disabled by setting INIT Reg-
ister bit 2 to a logical 1.
The Am79C30A/32A has facilities that allow the micro-
processor to read the status registers (status update is
inhibited during status read) or the IR at any time dur-
ing functional operation.



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