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參數(shù)資料
| 型號： | TPU2735 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Teletext Processor |
| 中文描述： | 圖文處理器 |
| 文件頁數(shù)： | 19/37頁 |
| 文件大?。?/td> | 1019K |
| 代理商： | TPU2735 |
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TPU 2735
19
7. The Control Registers of Register Chain 2
The registers which are used by the CCU to control the
TPU have the addresses 0/24/0 to 0/24/30 and are des-
ignated as register chain 2. The following pages define
the function of the individual registers. An asterisk*
marks those bits which can be modified by the TPU. In
a write access, each undefined control bit must be set to
zero to ensure future compatibility.
Register Chain 2
address
bytes
name
0/24/0
2
2
2
2
2
2
2
2
2
2
1
1
2
1
1
1
1
1
1
2
4
6
8
10
12
14
0/24/16
18
20
21
22
0/24/24
25
26
27
28
29
0/24/30
R–PR0
R–PR1
R–PR2
R–PR3
R–PR4
R–PR5
R–PR6
R–PR7
R–PS
R–SC
R–DS
R–DAC
R–SI
R–DC1
R–DC2
R–DC3
R–DC4
R–DC5
R–DC6
R–MC
page request
page selection
subcode
display selection
data acquistion
control
status indicator
memory control
display control
1
7.1. The Page Request Registers, R-PRx
Each sector of the acquisition block has its own page re-
quest register. Their structure can be seen below. They
have to be loaded with the page numbers of the pages
which shall be stored in the according sector when the
TPU receives this page. If more than one register con-
tains the same page number the register with the lowest
sector number has the highest priority.
R-PRx Page Request Registers
address 0/24/2x, 2-byte register
MSB
LSB
MSB
LSB
D7
D6
D5
D4
D3
D2
D1
D0
tens BCD
units BCD
requested page number
RES
NRFx
ERFx
LSB
D7
D6
D5
D4
D3
D2
D1
D0
requested magazine
number
(binary, 0 0 0
NUFx
CF1x
MSB
*
*
*
8)
x is the sector number where the page is to be stored.
RES:
Bit is reserved, set to zero
NUFx:
NUFx = 1 prevents the data acquisition unit of the TPU
from writing to the RAM sector x. NUFx can be used in
the HALT mode to protect a received page against modi-
fications.
no updating flag
ERFx:
The TPU sets ERFx = 1 if a bit error was detected during
the reception of a Teletext page. The TPU will load a
page with ERFx = 1 once again as soon as it is transmit-
ted again. ERFx has to be reset when the page request
register is loaded with a new page number.
error flag
NRFx:
NRFx has to be set to 1 if the CCU loads a new request
into R-PRx. The TPU resets NRFx when the requested
page has been received. NRFx influences the page
header (rolling header and color) when sector x or the
menu is displayed (see section 7.5. “Data Acquisition
Register R-DAC 1”).
new request flag
CF1x:
CF1x: = 1 indicates a conflict situation where the re-
quested page of sector x is involved. CF1x = 1 leads to
a longer access time (see section 4.4. “Multipage Con-
flict Situation”). CF1x has to be reset when the page re-
quest register is loaded with a new page number.
conflict flag 1
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