GC6016 Datasheet, PDF (25/46 Pages) Texas Instruments – Wideband Transmit-Receive Digital Signal Processors

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CEB
Write Cycle
GC6016
SLWS227A – NOVEMBER 2010 – REVISED MARCH 2011
Read Cycle
Addr
OEB
WEB
Data
Figure 13. MPU Interface Format
T0506-01
Serial Peripheral Interface (SPI)
The MPU and SPI interfaces can be only enabled one at a time. EMIFENA must be set to logic low to enable the
SPI interface. A three- or four-wire SPI interface is supported in the GC6016. It consists of SPIDENB, SPICLK ,
SPIDIO, and SPIDO-(SPARE) (output in four-wire mode) signals. See Table 25 and Figure 24.
JTAG Interface
The GC6016 includes a five-pin JTAG interface that supports boundary scan for all CMOS pads in the chip,
aside from the TESTMOD pin. The BBIN, BBOUT, RX, TX, and SYNC pins are all LVDS and do not get JTAG
boundary scan. IMPORTANT NOTE: if not using JTAG, the TRSTB signal should be grounded (or pulled to
ground through R ≤ 1 kΩ); otherwise, the JTAG port may take control of the pins. See Table 24 and Figure 23.
A BSDL file is available on the GC6016 Web page.
Input and Output Syncs
The GC6016 features two LVDS input syncs (SYNCA and SYNCB) and one LVDS output (SYNCOUT)
user-programmable sync. These are typically used as trigger/synchronization mechanisms to activate features
within the device. The input syncs can be used to trigger events such as:
• Power measurements
• DUC channel delay, mixer phase and dither
• Initializing/loading filter coefficients
• Capturing and sourcing of data in the capture buffers
• Controlling gating intervals for AGC and other adaptive loops
• Frequency NCO changes, or hopping synchronization
The SYNCA signal is used for device startup. The SYNCB signal can be used for shared feedback
synchronization between multiple GC6016 devices. The sync signal is active-high. The width (number of positive
edges of the DPD clock) of the sync signal depends on the configuration. See the GC6016 sync and MPU
application note to determine the proper sync duration. A typical sync-pulse duration is four DPD clocks. The
sync must be periodic, and usually starts at the beginning of the TX frame.
The output sync can be programmed to reflect triggering of specific events within the GC6016, and is primarily
used to output the capture-buffer sync out signal.
Copyright © 2010–2011, Texas Instruments Incorporated
Product Folder Link(s): GC6016
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