MPC8280 datasheet(586/1386 Pages) FREESCALE

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Serial Interface with Time-Slot Assigner

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

15-8

Freescale Semiconductor

Figure 15-4. Enabling Connections to the TSA

15.4

Serial Interface RAM

Each SI has a transmit RAM and a receive RAM, each with four banks of 64 halfword entries that enable

it to control TDM channel routing to all serial devices, including the MCCs. The SIx RAMs are

uninitialized after power-on reset; unwanted results can occur if the user does not program them before

enabling the multiplexed channels.

Each 16-bit SI RAM entry defines the routing of 1–8 bits or bytes at a time. In addition to the routing, up

to four strobe pins (logic OR of four strobes in the transmit RAM and four in receive RAM) can be asserted

according to the programming of the RAMs. The four SIx RAM banks can be configured in many different

ways to support various TDM channels. The user can define the size of each SIx RAM that is related to a

certain TDM channel by programming the starting bank of that TDM. Programming the starting shadow

bank address, described in Section 15.5.3, “SIx RAM Shadow Address Registers (SIxRSR),” determines

whether this RAM has a shadow for changing SIx RAM entries while the TDM channel is active. This

reduces the number of available SIx RAM entries for that TDM.

x RAM

Time-Slot

Assigner

TDM a,b,c,d Enable = 1

TDM a Pins

TDM b Pins

TDM c Pins

TDM d Pins

FCC1

FCC2

FCC3

SCC1

SCC2

SCC3

SCC4

SMC1

SMC2

MII1/UTOPIA 16

FC1 = 0

MII2/UTOPIA 8

FC2 = 00

MII3

FC3 = 0

SCC1 pins

SC1 = 0

SCC2 pins

SC2 = 0

SCC3 pins

SC3 = 0

SCC4 pins

SC4 = 0

SMC1 pins

SMC1 = 0

SMC2 pins

SMC2 = 0

MCC

TDM a channels

TDM b channels

TDM c channels

TDM d channels

In the CPM mux

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