TMS320DM368 Datasheet, PDF (198/208 Pages) Texas Instruments – Digital Media System-on-Chip (DMSoC)

TMS320DM368
SPRS668A – APRIL 2010
HCS
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HAS^(D)
1
HCNTL[B:A]
1
HR/W
1
HHWIL
HSTROBE^(A)(C)
2
2
2
3
2
1
2
1
2
1
4
3
HD[15:0]
(input)
HRDY^(B)
11
12
11
12
1st Half-Word
2nd Half-Word
18
18
5
13
5
13
A. HSTROBE refers to the following logical operation on HCS, HDS1, and HDS2: [NOT(HDS1 XOR HDS2)] OR HCS.
B. Depending on the type of write or read operation (HPID without auto-incrementing; HPIA, HPIC, or HPID with
auto-incrementing) and the state of the FIFO, transitions on HRDY may or may not occur.
C. HCS reflects typical HCS behavior when HSTROBE assertion is caused by HDS1 or HDS2. HCS timing
requirements are reflected by parameters for HSTROBE.
D. For proper HPI operation, HAS must be pulled up via an external resistor.
Figure 6-66. HPI16 Write Timing (HAS Not Used, Tied High)
6.24 Key Scan
The device contains Key Scan module that supports two types of Key Matrices - 4x4 and 5x3. It also
supports the following features :
• Supports the following two scan modes
– Channel Interval mode
– Scan Interval mode
• Programmable key scan time
– Strobe time
– Interval time
• Two input detection modes
– Direct mode
– 3-Data check mode
• Supports one interrupt to detect the following:
– Key input changes
– Periodic time intervals after a key is pressed
198 Peripheral Information and Electrical Specifications
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