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MPC5668EVB Users Manual Rev 0.1 May 2009
MPC5668EVBUM/D Page 21 of 29
The MLB and MOST
circuitry is located on the left
edge of the EVB .
3.10 MLB and Most
The EVB is fitted with a range of hardware to support the MOST communication protocol. These include:
SMSC OS81050 (U6) INIC interfaced to the MPC5668 via 3 pin Media Local Bus (MLB) interface.
INIC JTAG port (P12) and MLB monitor port (J88)
Tyco Physical optical transceiver (U8) interfaced to the SMSC OS81050
Dual footprint layout to allow the SMSC OS81050 to be replaced with the smaller ROM alternative
40 Pin header to allow the EVB to be interfaced to the MOST 150 EVB from SMSC.
Power Jumpers on the EVB are configured to allow the EVB to supply power to both the ROM and Flash
versions of the SMSC OS81050 INIC that are supported by the dual footprint on the EVB. By default the Flash
version of the OS81050 is fitted to the EVB. The jumpers also allow power to be removed from the INIC. The
power supply jumpers are detailed below. All Power supplies domains referred to in this table are for the Flash
based INIC. Please refer to the schematics to see how this affects the supply domains of the ROM INIC if it
has been fitted.
Table 3-22 INIC Power Supply Control (J35, J36, J55)
Jumper Position PCB Legend Description
J35
FITTED (D)
3.3v PWR
3.3v is applied to VDDP1 and VDDP2 of the INIC
REMOVED No 3.3v power is applied to VDDP1 and VDDP2
J36
FITTED (D)
2.5v PWR
2.5v is applied to VDDA1 and VDDA2.
REMOVED No power is applied to VDDA1 and VDDA2.
J55
FITTED (D)
2.5v PWR
2.5v is applied to VDDC1 and VDDC2.
REMOVED No power is applied to VDDC1 and VDDC2.
The Pin out for the INIC JTAG connector filled to the EVB is show in Figure x below:
Figure 3-12. INC5668 JTAG Connector
The INIC pins MLBDI, MLBSI, RMCK, SCK and FSY are brought out to the header J22, to allow for monitoring
and control if required. J88 provides the MLB monitor header that is compatible with the SMSC MLB Monitor
hardware. The Pin out of this is shown in Figure x below.
Figure 3-13. MLB Monitor Connector
2 VSS
4 INIC /BOOT
6 3.3v
8 TCK
10 VSS
12 RST
14 TMS
N/C 1
N/C 3
VSS 5
TDI 7
3.3v 9
TDO 11
N/C 13
2 VSS
4 VSS
6 VSS
8 VSS
10 VSS
MLBCLK 1
MLBSIG 3
MLBDAT 5
MLBSI 7
MLBDI 9