MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 333

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

9.5.7.5 Transfer Size
9.5.7.6 Address Types
MPC555
USER’S MANUAL
The transfer size signals (TSIZ[0:1]) indicate the size of the requested data transfer.
During each transfer, the TSIZ signals indicate how many bytes are remaining to be
transferred by the transaction. The TSIZ signals can be used with BURST and AD-
DR[30:31] to determine which byte lanes of the data bus are involved in the transfer.
For nonburst transfers, the TSIZ signals specify the number of bytes starting from the
byte location addressed by ADDR[30:31]. In burst transfers, the value of TSIZ is al-
ways 00.
The address type (AT[0:3]), program trace (PTR), and reservation transfer (RSV) sig-
nals are outputs that indicate one of 16 address types. These types are designated as
either a normal or alternate master cycle, user or supervisor, and instruction or data
type. The address type signals are valid at the rising edge of the clock in which the
special transfer start (STS) signal is asserted.
A special use of the PTR and RSV signals is for the reservation protocol described in
9.5.9 Storage
tion on show cycles.
Table 9-7
definitions achieved by combining these pins.
/
MPC556
summarizes the pins used to define the address type.
Reservation. Refer to
Asserted
Negated
Negated
Negated
Negated
BURST
Table 9-6 BURST/TSIZE Encoding
PTR
RSV
STS
AT0
AT1
AT2
AT3
Pin
TS
Table 9-7 Address Type Pins
EXTERNAL BUS INTERFACE
Rev. 15 October 2000
0 = Special transfer
1 = Normal transfer
0 = Start of transfer
1 = No transfer
Must equal zero on MPC555 / MPC556
0 = Supervisor mode
1 = User mode
0 = Instruction
1 = Data
Reservation/Program Trace
0 = Program trace
1 = No program trace
0 = Reservation data
1 = No reservation
TSIZ(0:1)
01
10
11
00
00
9.5.13 Show Cycle Transactions
Function
Burst (16 bytes)
Transfer Size
Half-word
Word
Byte
x
Table 9-8
for informa-
MOTOROLA
lists all the
9-37