PNX1500E NXP Semiconductors, PNX1500E Datasheet - Page 811
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PNX1500E
Manufacturer Part Number
PNX1500E
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1500E.pdf
(828 pages)
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Table 5: DTL Interface Rules
PNX15XX_PNX952X_SER_N_4
Product data sheet
Module
Item Unit
Size
8 bits
16 bits
32 bits
System
Endian Mode
either
either
either
6.2.1 DTL Data Ordering Rules
6.2 DMA Across a DTL Interface
Two standard solutions are provided to interface the DTL to the PMAN MTL network
buses:
Note that the connection from the 32-bit DTL interface to the MTL Bus uses swapping
only if the 32-bit DTL interface is not address invariant.
The following subsections show how unit data of different lengths travels across the
three key interfaces: the 32-bit DTL interface, the DCS Network and the MTL Memory
Bus.
Modules that interface to the DTL bus can deal with data on the bus in two ways:
Data is transferred across the DTL Interface by the following rules:
Modules dealing with 8, 16 or 32-bit units must place bytes on the DTL interface given
in
views based on the cmd_data_size .
DTL_D[31:24]
item #4 with
address a+3
item #2 with address a+2
bits 15..8
item with address a
bits 31..24
•
•
•
•
•
•
Table
The “PMAN Buffer” connects the 32-bit DTL interface to the MTL-Bus.
The “packer Lego” and “DMA Buffering” map the 32-bit DTL interface to the 64-bit
MTL Memory Bus.
Data can be put on the bus in their natural form (without flipping them for endian
mode but indicating the size of the data with cmd_data_size ). In this case, the
module is not aware of the SYS_ENDIAN bit in the system. The module follows
DTL data ordering rules.
Modules can put the data on the bus in the address invariant mode (Note: This is
also the 8-bit mode). In this mode, the module uses the SYS_ENDIAN bit to flip
the data appropriately depending on the size of the data and the system endian
mode.
The value of cmd_data_size indicates the width of the data item(s) as 8 *
2
16-bit data, cmd_data_size is 0x1, etc.
In all cases, the data item (e.g. Byte) that corresponds to the lowest address is
transferred on the low order data bits of the DTL rd_data or wr_data
cmd_data_size
7. The Endian Swap Units then convert the data into true address invariant
Rev. 4.0 — 03 December 2007
bits. For example, with 8-bit data, cmd_data_size is set to 0x0, for
DTL_D[23:16]
item #3 with
address a+2
bits 7..0
bits 23..16
DTL_D[15:8]
item #2 with
address a+1
item #1 with address a
bits 15..8
bits 15..8
PNX15xx/952x Series
Chapter 29: Endian Mode
DTL_D[7:0]
item #1 with
address a
bits 7..0
bits 7..0
© NXP B.V. 2007. All rights reserved.
29-811
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