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SAA7346H Datasheet(PDF) 9 Page - NXP Semiconductors

Part # SAA7346H
Description  Shock absorbing RAM addresser
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

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July 1994
9
Philips Semiconductors
Preliminary specification
Shock absorbing RAM addresser
SAA7346
Table 3
Internal status signals.
Table 4
FIFO length as a function of CONFIG, Lm and Lm1.
STATUS
DESCRIPTION
Lm and Lm1
The two Most Significant Bits (MSB) of the FIFO. These can be used to display the FIFO length or
correct the subcode time information. The FIFO length is shown in Table 4.
FRM_ER
Framing error flag is set when:
1. The microcontroller did not accept the previous subcode flag on time. When this occurs the NSF
flag will be set together with FRM_ER.
2. The S_NSF generated signal does not coincide with the NSF signal generated by the decoder.
When this occurs there has been a FIFO overflow in the decoder or a jump.
Framing error flag is reset when status register is read.
NSF
New subcode frame is set when an absolute sync is recovered from the CFLG input. Reset when
status register is read. If the NSF is still set at the next occurrence of a subcode frame, FRM_ER will
be set indicating that the microcontroller has lost a frame.
Full
Full is set when the FIFO is full. When the flag is set the microcontroller must jump back to the
previous track. Reset when status register is read.
Empty
Empty is set when the FIFO is emptied during hold or shock modes. DRAM writing should resume
immediately unless echo is set in the command register. If set, writing can only resume when PFB or
flush are set in the command register. The latter will cause a discontinuity in music. Note when set
there is a complete word left in the FIFO giving the SAA7346 controller time to switch to fill mode.
SSD
Set shock detect is set when SAA7346 detects a shock.
Fill
Fill is set when writing data to the DRAM or by setting the command register flags PFB or flush. Reset
internally when full or SSD are set.
CONFIG
Lm
Lm1
FIFO LENGTH (s)
0
0
0
0.00 to 0.19
0
0
1
0.19 to 0.39
0
1
0
0.39 to 0.58
0
1
1
0.58 to 0.78
1
0
0
0.00 to 0.75
1
0
1
0.75 to 1.50
1
1
0
1.50 to 2.25
1
1
1
2.25 to 2.97
Fig.7 Microcontroller READ timing.
handbook, full pagewidth
B7
B6
B5
B4
B3
B2
B1
B0
SICL
SILD
SIDA
MGB434


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