SPC5121YVY400BR Freescale, SPC5121YVY400BR Datasheet - Page 77

• Manufacturer Part Number: SPC5121YVY400BR
• Manufacturer: Freescale

Specifications of SPC5121YVY400BR

• Lead Free Status / RoHS Status: Supplier Unconfirmed

4.4
The MPC5121e/MPC5123 requires external pull-up or pull-down resistors on certain pins.
4.4.1
The MPC5121e/MPC5123 requires a pull-down resistor on the test pin TEST.
4.4.2
PCI control signals always require pull-up resistors on the motherboard (not the expansion board) to ensure that they contain
stable values when no agent is actively driving the bus. This includes PCI_FRAME, PCI_TRDY, PCI_IRDY, PCI_DEVSEL,
PCI_STOP, PCI_SERR, PCI_PERR, and PCI_REQ.
Refer to the PCI Local Bus specification.
4.5
The MPC5121e/MPC5123 provides you with an IEEE 1149.1 JTAG interface to facilitate board/system testing. It also provides
a Common On-Chip Processor (COP) Interface, which shares the IEEE 1149.1 JTAG port.
The COP Interface provides access to the MPC5121e/MPC5123's embedded e300 processor and to other on-chip resources.
This interface provides a means for executing test routines and for performing software development and debug functions.
4.5.1
Boundary scan testing is enabled through the JTAG interface signals. The TRST signal is optional in the IEEE 1149.1
specification but is provided on all processors that implement the PowerPC architecture. To obtain a reliable power-on reset
performance, the TRST signal must be asserted during power-on reset.
Freescale Semiconductor
Pull-Up/Pull-Down Resistor Requirements
JTAG
Pull-Down Resistor Requirements for TEST pin
Pull-Up Requirements for the PCI Control Lines
TRST
Weak pull-up or pull-down
Figure 59. Recommended connection for pins of unused USB PHY
VDD_IO
VDD_IO
VSS
NC
VSS
VSS
VSS
VSS
VSS
NC
VSS
VSS
MPC5121E/MPC5123 Data Sheet, Rev. 3
USB_XTALI
USB_TPA
USB_DP
USB_XTALO
USB_DN
USB_VBUS
USB_UID
USB_RREF
USB_VSSA_BIAS
USB_VSSA
USB_PLL_GND
USB_PLL_PWR3
USB_VDDA_BIAS
USB_VDDA
MPC5121e/MPC5123
System Design Information
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