MOD5234-100IR NetBurner Inc, MOD5234-100IR Datasheet - Page 421

• Manufacturer Part Number: MOD5234-100IR
• Description: MOD5234 10/100 ETHERNET MODULE
• Manufacturer: NetBurner Inc
• Type: Controllers & Processorsr

Specifications of MOD5234-100IR

• Interface: I²C, SPI, UART
• Voltage - Supply: 2.5V
• Mounting Type: Surface Mount
• Package / Case: Module
• Product: Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Format: -
• Baud Rates: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q4483564

20.2.2.3 Host Interface
The host interface allows the MCF5235 ColdFire core to control the operation of the eTPU. In
order for the eTPU to start operation, the core must initialize the eTPU by writing to the
appropriate host interface registers to assign a function and priority to each channel. In addition,
the MCF5235 ColdFire core writes to the host service request and channel configuration registers
to further define operation for each initialized channel.
20.2.2.4 Shared Data memory (SDM)
The SDM works as data RAM which can be accessed by the MCF5235 ColdFire core and the
eTPU engine. This memory is used for either:
The SDM 32 bits wide, and is accessible by the host in any of the three formats: byte, 16-bit, or
32-bit. The eTPU can access the SDM’s full 32 bits, the lower 24 bits, or the upper byte (8-bit).
The host can also access the SDM space mirrored in other areas with parameter sign extension
(PSE). PSE allows data with fewer than 32 bits to be accessed as 32-bit sign-extended data without
using the MCF5235 Coldfire core’s bandwidth to extend the data. PSE accesses differ from the
usual host accesses to the original SDM area as follows:
Freescale Semiconductor
• Information transfer between the MCF5235 ColdFire core and the eTPU.
• Data storage for the eTPU microcode program.
• Writes are effective only to the lower 24 bits of a longword: the longword’s most significant
• Reads return the lower 3 bytes of a longword sign-extended to 32 bits, that is: the most
byte kept unaltered in the SDM.
significant bit of the longword’s 2nd most significant byte is copied in all 8 bits of the most
significant read byte.
SDM
The host must first initialize the memory prior to enabling any eTPU
function. Then the host enables eTPU access to the SCM (which also
disables host access).
[31:24]
[23:16]
MCF5235 Reference Manual, Rev. 2
Write 24 bit data
NOTE
[15:8]
[7:0]
Overview
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