Utopia Mode Initialization - Freescale Semiconductor MPC850 User Manual

Signal PDPAR = 0
PD15 Port D15
PD14 Port D14
PD13 Port D13
PD12 Port D12
PD11 Port D11
PD10 Port D10
PD9 Port D9
PD8 Port D8
PD7 Port D7
PD6 Port D6
PD5 Port D5
PD4 Port D4
PD3 Port D3
42.2.5 RISC Controller Configuration Register (RCCR)
The RCCR[DR1M,DR0M] bits must be set (level-sensitive IDMA request signals) to
enable UTOPIA operation. Also, program RCCR[DRQP] to 0b01 to give SCC transfers
higher priority.

42.2.6 UTOPIA Mode Initialization

The following procedure is required for proper initialization of the UTOPIA interface:
1. Because the UTOPIA port activates immediately upon initialization, configure the
ATM parameters and data structures first.
2. Program PCPAR, PCDIR, and PCSO to enable TxClav and RxClav.
The ATM controller starts searching for SOC and sets SRSTATE[SNC] as soon as the first
SOC is found.
Table 42-3. Port D Pin Assignment
PDPAR=1
UT=0
PDDIR=0 PDDIR=1
— —
— —
— —
— —
— —
— —
— —
— —
— —
— —
— —
— —
— —
Chapter 42. Interface Configuration
UTOPIA Mode Registers
Input to On-Chip
Peripherals
UT=1
UTPB[0] —
UTPB[1] —
UTPB[2] —
UTPB[3] —
RxEnb —
TxEnb —
UtpClk —
— —
UTPB[4] —
UTPB[5] —
UTPB[6] —
UTPB[7] —
SOC —