MPC852TADS Freescale Semiconductor, MPC852TADS Datasheet - Page 61

• Manufacturer Part Number: MPC852TADS
• Description: Networking Modules & Development Tools ADS BOARD FOR 852
• Manufacturer: Freescale Semiconductor
• Type: Network Controller & Processorr

Specifications of MPC852TADS

• Memory Type: Flash, SDRAM
• Interface Type: RS-232, Ethernet, PCMCIA
• Operating Voltage: 1.8 V to 3.3 V
• Operating Temperature Range: 0 C to + 30 C
• Board Size: 233 mm x 150 mm
• Product: Modules
• For Use With/related Products: MPC852T
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

49
A. Not supported on the board.
B. If the PC-Card has protection diodes on its inputs then they will force down any input signals regardless of their
ethernet (10-Base-T) via the same transceiver - the DM9161E by Davicom.
The DM9161E are connected to Port D via MII interface. The initial configuration of the DM9161E on the
MPC852TADS is set by external resistors to 100Base-T Full Duplex in MII mode.
The DM9161E reset input is driven by either asserting the RSTMII bit in BCSR4 (see
a specific bit in an internal register via MII I/F.
To allow external use of Port D, their pins appear at the expansion connectors and the ethernet transceiver may be
Disabled / Enabled at any time via the MIIs’ MDIO port or via MIIRXEN bit in BCSR4.
The DM9161E is able to interrupt the MPC via IRQ6 line.
4•9•3•1
The DM9161E is controlled via 2 wire interface: a clock (MDC) and a bidirectional data line (MDIO). This is in fact
a bus, i.e., up to 32 devices may reside over it, while the protocol defines a 5-bit slave address field, which is compared
against the slave address set to each device by hardware during device reset, according to the levels on some pins. On
the board, the slave address is hard-set to b00000 for Fast Ethernet and b00011 for Ethernet. The MPC interfaces this
port using two PI/O pins: MII_MDIO for MDIO and PD12/MIIMDC for MDC. There is no special support within
the MPC for the MDIO port and the protocol is implemented in S/W.
The MDIO port may interrupt a host in 2 ways: (a
icated interrupt line MDINT. This line is connected to the MPC’s IRQ6 line in Fast Ethernet I/F and IRQ3 line in
Ethernet I/F, appearing also at the expansion connectors.
4•10
To enhance PCMCIA I/F development, the ADS has a dedicated PCMCIA port. Support is only provided to 5V PC-
Cards that are PCMCIA standard 2.1+ compliant. The MPC generates all necessary control signals. To both protect
MPC signals from external hazards and to provide sufficient drive capability, a set of buffers and latches is provided
over the PC-Card address, data and strobe lines.
To conform with the ADS design spirit, such as maximizing the number of available MPC resources available for
external application development, input buffers are provided for input control signals. The buffers are controlled by
the PCC_EN~ bit in BCSR1 and by writing’1’ /’0’ to PCMCIA port that may be Disabled / Enabled at any time. If
the PCMCIA channel has been disabled then its associated pins become available for off-board use via the expansion
connectors.
The board has a loudspeaker that is connected to the MPC’s SPKROUT line. The loudspeaker is buffered from the
MPC and low-pass filtered. When the PCC_EN~ bit in BCSR1 is negated (high) then the loudspeaker buffer is tri-
stated so the SPKROUT signal of the MPC may be used for an alternate function.
It is not recommended
ceivers are tri-stated and may only be driven when a PC-Card is powered.
FIGURE 4-5 "PCMCIA Port Configuration" on page 50
driven level.
DM9161E Control
PCMCIA Port
B
to apply control signals to an unpowered PC-Card as the strobe / data signal buffers / trans-
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Functional Description
MPC852TADS - User’s Manual
A
) driving low the MDIO line during IDLE time or (b) using a ded-
illustrates a block diagram of the PCMCIA port.
TABLE
4-20.) or by asserting
Release 1.0