MPC852TADS Freescale Semiconductor, MPC852TADS Datasheet - Page 35

• Manufacturer Part Number: MPC852TADS
• Description: Networking Modules & Development Tools ADS BOARD FOR 852
• Manufacturer: Freescale Semiconductor
• Type: Network Controller & Processorr

Specifications of MPC852TADS

• Memory Type: Flash, SDRAM
• Interface Type: RS-232, Ethernet, PCMCIA
• Operating Voltage: 1.8 V to 3.3 V
• Operating Temperature Range: 0 C to + 30 C
• Board Size: 233 mm x 150 mm
• Product: Modules
• For Use With/related Products: MPC852T
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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A. The refresh rate parameter is the only one initialized to the start-up frequency. Initialization to 66Mhz would have
The MPC internal registers must be programmed after Hard Reset. See the following paragraphs for descriptions. The
addresses and programming values are in hexadecimal base. For more information and a better understanding of the
below noted initialization, refer to the MPC866 User Manual.
3•4•1
The MPC852TADS memory controller is initialized for 66 MHz operation. For example, register programming is
based on a 66 MHZ timing calculation; an exception being the refresh timer that is initialized for 16.67Mhz. The latter
is the lowest frequency at which the ADS may begin to operate. The ADS may be made to wake-up at 25MHz
with inefficient initialization for there are too many wait-states inserted. As a consequence, an additional set of ini-
tialization is provided in order to support an effective 25MHz operation.
The ADS is initialized at 66Mhz in order to allow for a proper, though not efficient, ADS operation via all available
ADS clock frequencies.
SIUMCR
SYPCR
TBSCR
PISCR
Register
been inadequate for a board is running at a lower frequency. Thus, for the best bus bandwidth availability, the re-
fresh rate should be adapted to the current system clock frequency.
Memory Controller Registers Programming
01012440
FFFFFF88
00C2
0082
Init Value[hex]
TABLE 3-3. SIU REGISTER PROGRAMMING
Freescale Semiconductor, Inc.
For More Information On This Product,
Internal arbitration. External master arbitration priority - 0. External arbitration
priority - 0. PCMCIA channel II pins - PCMCIA. Debug Port on JTAG port pins.
FRZ/IRQ6~ - FRZ. Debug register - locked. No parity for non-CS regions. DP(0:3)/
IRQ(3:6)~ pins - DP(0:3). Reservation disabled. SPKROUT - Tri-stated.
BS_A(0:3)~ and WE(0:3)~ are only driven on their dedicated pins. GPL_B5~
enabled. GPL_A/B(2:3)~ function as GPLs.
Enabled. S/W watch-dog - Freeze. S/W watch-dog - disabled. S/W watch-dog (if
enabled) causes NMI. S/W (if enabled) not prescaled.
No interrupt level. Reference match indications cleared. Interrupts disabled. No
freeze. Time-base disabled.
No level for interrupt request. Periodic interrupt disabled. Clear status. Interrupt
disabled. FREEZE. Periodic timer disabled.
Software watchdog timer count - FFFF. Bus-monitor timing FF. Bus-monitor -
OPERATING INSTRUCTIONS
Go to: www.freescale.com
MPC852TADS - User’s Manual
Description
Release 1.0
A
but