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TMS570LS0714
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SPNS226E – JUNE 2013 – REVISED NOVEMBER 2016
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TMS570LS0714
Peripheral Information and Electrical Specifications
Copyright © 2013–2016, Texas Instruments Incorporated
7.7.7
High-End Timer Transfer Unit (HET)
A High-End Timer Transfer Unit (HTU) can perform DMA type transactions to transfer N2HET data to or
from main memory. A Memory Protection Unit (MPU) is built into the HET TU.
7.7.7.1
Features
•
CPU and DMA independent
•
Master port to access system memory
•
8 control packets supporting dual buffer configuration
•
Control packet information is stored in RAM protected by parity
•
Event synchronization (HET transfer requests)
•
Supports 32- or 64-bit transactions
•
Addressing modes for HET address (8- or 16-byte) and system memory address (fixed, 32- or 64-bit)
•
One shot, circular, and auto-switch buffer transfer modes
•
Request lost detection
7.7.7.2
Trigger Connections
For the transfer request line trigger connections to the N2HET TU when an instruction-specific condition is
true, see
Table 7-28
and
Table 7-29
.
Table 7-28. HET TU1 Request Line Connection
MODULES
REQUEST SOURCE
HET TU1 REQUEST
N2HET1
HTUREQ[0]
HET TU1 DCP[0]
N2HET1
HTUREQ[1]
HET TU1 DCP[1]
N2HET1
HTUREQ[2]
HET TU1 DCP[2]
N2HET1
HTUREQ[3]
HET TU1 DCP[3]
N2HET1
HTUREQ[4]
HET TU1 DCP[4]
N2HET1
HTUREQ[5]
HET TU1 DCP[5]
N2HET1
HTUREQ[6]
HET TU1 DCP[6]
N2HET1
HTUREQ[7]
HET TU1 DCP[7]
Table 7-29. HET TU2 Request Line Connection
MODULES
REQUEST SOURCE
HET TU2 REQUEST
N2HET2
HTUREQ[0]
HET TU2 DCP[0]
N2HET2
HTUREQ[1]
HET TU2 DCP[1]
N2HET2
HTUREQ[2]
HET TU2 DCP[2]
N2HET2
HTUREQ[3]
HET TU2 DCP[3]
N2HET2
HTUREQ[4]
HET TU2 DCP[4]
N2HET2
HTUREQ[5]
HET TU2 DCP[5]
N2HET2
HTUREQ[6]
HET TU2 DCP[6]
N2HET2
HTUREQ[7]
HET TU2 DCP[7]