Multicore Fixed and Floating-Point System-on-Chip
Copyright 2012 Texas Instruments Incorporated
TMS320C6670 Peripheral Information and Electrical Specifications
215
SPRS689D—March 2012
TMS320C6670
Figure 7-56
AIF2 Physical Layer Synchronization Pulse Timing
Figure 7-57
AIF2 Radio Synchronization Pulse Timing
Figure 7-58
AIF2 Timer External Frame Event Timing
7.31 Receive Accelerator Coprocessor (RAC)
The TMS320C6670 has two Receive Accelerator Coprocessor (RAC) subsystems. Each RAC subsystem is a receive
chip-rate accelerator based on a generic correlator coprocessor (GCCP). It supports UMTS (Universal Mobile
Telecommunications System) operations and assists in transferring data received from the antenna to the receive
core and performs receive functions that target the W-CDMA macro bits.
The RAC subsystem consists of several components:
•
Two GCCP accelerators for finger despread (FD), path monitor (PM), preamble detection (PD), and stream
power estimator (SPE).
•
Back-end interface (BEI) for management of the RAC configuration and the data output.
•
Front-end interface (FEI) for reception of the antenna data for processing and access to all MMRs
(memory-mapped registers) and memories in the RAC components.
The RAC has a total of three ports connected to the switch fabric:
•
BEI includes two master connections to the switch fabric for output data to device memory. One is 128-bit and
the other is 64-bit, both are clocked at CPU/3 rate.
•
The FEI has a 64-bit slave connection to the switch fabric for input data as well as direct memory access (to
facilitate debug).
Table 7-84
AIF2 Timer Module Switching Characteristics
(see
No.
Parameter
Min
Max
Unit
External Frame Event
14
tw(EXTFRAMEEVENTH)
Pulse width, EXTFRAMEEVENT output high
4 * C1
(1)
1 C1 = tc(RP1CLKN/P)
ns
15
tw(EXTFRAMEEVENTL)
Pulse width, EXTFRAMEEVENT output low
4 * C1
ns
End of Table 7-84
PHYSYNC
11
10
RADSYNC
13
12
EX
T
F
RAM
E E
V
EN
T
15
1
4
Содержание TMS320C6670
Страница 225: ......