Filter
Top Products
MOTOROLA MSC8101ADS RevB User’s Manual 55
Functional Description
• Buffers Enable/Disable.
• Device Reset.
4) Host Interface which includes:
• Buffers Enable/Disable
• Host Acknowledge Enable
5) ATM Port Control which includes:
• Transceiver Enable / Disable
• Device Reset.
6) Fast Ethernet Port Control which includes:
• Transceiver Initial Enable
• Device Reset
7) RS232 port 1 Enable / Disable.
8) RS232 port 2 Enable / Disable.
9) Flash Size / Delay Identification.
10) External (off-board) tools Support which include:
• Tool Identification
• Tool Revision
• Tool Status Information
11) S/W Option Identification.
12) ADS Revision code.
Since part of the ADS’s modules are controlled by the BCSR and since they may be disabled in
favor of external hardware, the enable signals for these modules are presented at the CPM expan-
sion connectors, so that off- board hardware may be mutually-exclusive enabled with on-board
modules.
For reason to achieve maximum SW compatibility with Voyager ADS the usable control/status bits
will be populated at the corresponding addresses.
5•11•1 BCSR0 - Board Control / Status Register 0
The BCSR0 serves as a control register on the ADS. Although it resides only over D(0:7) lines of
the PPC data bus, it is accessed as a word at offset 0 from BCSR base address. It may be read
or written at any time. BCSR0 gets its defaults upon Power-On reset. BCSR0 fields are described
in TABLE 5-9. "BCSR0 Description" below:
TABLE 5-9. BCSR0 Description
BIT MNEMONIC Function
PON
DEF
ATT.
0HOSTCSP
Host Chip Select Polarity. Defines the chip-select polarity for Host I/F, for
both chip-select inputs HCS1 and HCS2. When low chip-selects have
negative polarity, otherwise - positive.
0 R,W
1 HOSTRQAC
Host Request or Acknowledge Select. When Host I/F supports DMA
acknowledge, this bit should be set low and high for double host request
mode. This bit allows to change direction of external buffer.
0 R,W
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
nc...