參數(shù)資料
型號(hào)： SAA2022GP
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Tape formatting and error correction for the DCC system
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： PLASTIC, SOT-208A, QFP-64
文件頁(yè)數(shù)： 38/52頁(yè)
文件大小： 208K
代理商： SAA2022GP
February 1994
38
Philips Semiconductors
Product specification
Tape formatting and error
correction for the DCC system
SAA2022
Mode changes
Table 24
Possible mode changes for the SAA2022.
CURRENT MODE
NEW MODE
DPAP
DRAR
DPAR
DPAP
YES
YES
DRAR
YES
DPAR
YES
T
IMING FOR
M
ODE
C
HANGES
Mode change DPAP to DRAR
This mode change occurs at the end of the time segment
in which the SAA2022 receives the new settings. Writing
of the first MAIN and AUX data commences at the start of
the time segment 1 which follows two subsequent end of
time segment 3 intervals. The delay to writing to tape is
approximately 222 ms, as shown in Fig.22. If “seamless
appending” is required the new settings should be sent to
the SAA2022 during time segment 2.
Mode change DPAP to DPAR
This mode change occurs at the first end of time segment
2 after the SAA2022 receives the new settings. Output of
AUX to tape begins at the start of the following time
segment 1, (i.e.
≈
85.3 ms after the mode change), as
shown in Fig.23.
Mode change DRAR to DPAP
This mode change occurs at the first end of time
segment 0 after the SAA2022 receives the new setting.
Writing of MAIN and AUX data stops immediately after the
mode change. The time segment jumps back to 0, URDA
goes HIGH and stays HIGH for 5 time segments
(
≈
213.3 ms) after which it goes LOW, as shown in Fig.24.
Mode change DPAR to DPAP
This mode change occurs at the first end of time
segment 0 after the SAA2022 receives the new setting.
The writing of AUX data to tape stops immediately after the
mode change. The first AUX read from tape can be
expected during the following time segment 0 or 1 (i.e.
128 to 170.67 ms after the mode change), as shown in
Fig.25.
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