FCC Transparent Controller
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
37-4 Freescale Semiconductor

Figure 37-2. Sending Transparent Frames between PowerQUICCIIs

PowerQUICC II(A) and PowerQUICC II(B) exchange transparent frames and synchronize each other using RTS and CD. However, CTS is not required because transmission begins at any time. Thus, RTS is connected directly to the other PowerQUICC II’s CD. GFMR[SYNL] is not used and transmission and reception from each PowerQUICC II are independent.
RXD
CD
CLKx
TXD
RTS
CD
RXD
BRGOx
RTS
TXD
CLKx BRGOx
BRGOx
Last Bit of Frame Data
First Bit of Frame Data
(Output is CLKx Input)
TXD
(Output is RXD Input)
RTS
(Output is CD Input) or CRC
TxBD[L] = 1 Causes Negation of RTS
CD Lost Condition Terminates Reception of Frame
PowerQUICCII (A) PowerQUICCII (B)
Notes:
1Each PowerQUICCII generates its own transmit clocks. If the transmit and receive clocks are the same, one can
generate transmit and receive clocks for the other PowerQUICCII. For example, CLKx on PowerQUICCII (B) could
be used to clock the transmitter and receiver
2CTS should be configured as always asserted in the parallel I/O port or connected to ground externally.
3The required GSMR configurations are DIAG= 00, CTSS=1, CTSP is a don’t care, CDS=1, CDP=0, TTX=1, and
TRX=1. REVD and TCRC are application-dependent.
4The transparent frame contains a CRC if TxBD[TC] is set.