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DP83916 Datasheet(PDF) 51 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza DP83916
Descripción Electrónicos  SONICTM-16 Systems-Oriented Network Interface Controller
PDF  96 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83916 Datasheet(HTML) 51 Page - National Semiconductor (TI)

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50 Bus Interface (Continued)
53 SYSTEM CONFIGURATION
Any device that meets the SONIC-16 interface protocol and
electrical requirements (timing threshold and loading) can
be interfaced to SONIC-16 Since two bus protocols are pro-
vided via the BMODE pin the SONIC-16 can interface di-
rectly to most microprocessors
Figure 5-3 shows a typical
interface to the NationalIntel style bus (BMODEe0) and
Figure 5-4 shows a typical interface to the Motorola style
bus (BMODEe1)
The BMODE pin also controls byte ordering
When
BMODEe1 big endian byte ordering is selected and when
BMODEe0 little endian byte ordering is selected
54 BUS OPERATIONS
There are two types of system bus operations 1) SONIC-16
as a slave and 2) SONIC-16 as a bus master When
SONIC-16 is a slave (eg a CPU accessing SONIC-16 reg-
isters) all transfers are non-DMA When SONIC-16 is a bus
master (eg SONIC-16 accessing receive or transmit buff-
erdescriptor areas) all transfers are block transfers using
SONIC-16’s on-chip DMA
This section describes the
SONIC-16 bus operations Pay special attention to all sec-
tions labeled as ‘‘Note’’ These conditions must be met for
proper bus operation
TLF11722 – 25
FIGURE 5-3 SONIC-16 to NS32532 Interface Example
51



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