MPC561MZP56 Freescale Semiconductor, MPC561MZP56 Datasheet - Page 446

• Manufacturer Part Number: MPC561MZP56
• Description: IC MPU 32BIT 56MHZ PPC 388-PBGA
• Manufacturer: Freescale Semiconductor
• Series: MPC5xxr

Specifications of MPC561MZP56

• Core Processor: PowerPC
• Core Size: 32-Bit
• Speed: 56MHz
• Connectivity: CAN, EBI/EMI, SCI, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 64
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 2.7 V
• Data Converters: A/D 32x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 388-BGA
• Controller Family/series: POWER 5xx
• No. Of I/o's: 56
• Ram Memory Size: 31KB
• Cpu Speed: 56MHz
• No. Of Timers: 32
• Embedded Interface Type: QSPI, SCI, UART
• No. Of Pwm Channels: 12
• Rohs Compliant: No
• Processor Series: MPC5xx
• Core: PowerPC
• Data Bus Width: 32 bit
• Data Ram Size: 32 KB
• Interface Type: CAN, JTAG, QSPI, SCI, SPI, UART
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 56
• Number Of Timers: 22
• Operating Supply Voltage: 2.6 V to 5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 2 (10 bit, 32 Channel)
• For Use With: MPC564EVB - KIT EVAL FOR MPC561/562/563/564
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: No

L-Bus to U-Bus Interface (L2U)
11.7.1
L-bus show cycles are disabled during reset and must be configured by setting the LSHOW[0:1] bits in the
L2U_MCR.
11.7.2
When show cycles are enabled in the L2U module, there is a performance penalty on the L-bus. This
occurs because the L2U module does not support more than one access being processed at any time. To
ensure that only one access at a time is processed, and not lose an L-bus access that would have been show
cycled, the L2U module will arbitrate for the L-bus whenever it is processing any access. This L-bus
arbitration will prevent any other L-bus master from starting a cycle that might turn out to be a qualifiable
L-bus show cycle.
For L-bus show cycles, the minimum performance impact on the L-bus will be three clocks. This minimum
impact assumes that the L-bus slave access is a 1-clock access, and the L2U module acquires immediate
bus grant on the U-bus. The L2U has to wait two clocks before completing the show cycle on the U-Bus,
thus using up five clocks for the complete process.
A retried access on the L-bus (no address acknowledge) that qualifies to be show cycled, will be accepted
when it is actually acknowledged. This will cause a 1-clock delay before an L-bus master can retry the
access on the L-bus, because the L2U module will release L-bus one clock later.
L2U asserts the internal bus request signal on the U-bus for a minimum of two clocks when starting a show
cycle on the U-bus.
11.7.3
The L2U module behaves as both a master and a slave on the U-bus during show cycles. The L2U starts
the U-bus transfer as a bus master and then completes the address phase and data phase of the cycle as a
slave. The L2U follows U-bus protocol of in-order termination of the data phase.
The USIU can control the start of show cycles on the U-bus by asserting the no-show cycle indicator. This
will cause the L2U module to release the U-bus for at least one clock before retrying the show cycle.
11.7.4
The L2U performs the following sequence of actions for an L-bus-write show cycle.
11-10
1. Arbitrates for the L-bus to prevent any other L-bus cycles from starting
Programming Show Cycles
Performance Impact
Show Cycle Protocol
L-Bus Write Show Cycle Flow
Table 11-3
LSHOW
00
01
10
11
shows the configurations of the LSHOW[0:1] bits.
MPC561/MPC563 Reference Manual, Rev. 1.2
Show address and data of all L-bus space read and write cycles
Table 11-3. L2U_MCR LSHOW Modes
Show address and data of all L-bus space write cycles
Reserved (Disable L-bus show cycles)
Disable L-bus show cycles
Action
Freescale Semiconductor