- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373821 > ZR36067 (Electronic Theatre Controls, Inc.) AV PCI CONTROLLER PDF資料下載
參數(shù)資料
| 型號： | ZR36067 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | AV PCI CONTROLLER |
| 中文描述： | 影音PCI控制器 |
| 文件頁數(shù)： | 21/48頁 |
| 文件大?。?/td> | 580K |
| 代理商： | ZR36067 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁當前第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁
21
AV PCI CONTROLLER
mand” information, written by the host, for the next available
buffer. Table 10 shows the interpretation for this
case.
If the STAT_BIT=‘1‘, the content of the entry is the “status” infor-
mation, written by the ZR36067, of the most recently processed
field or frame. Table 11 shows the interpretation for this case.
9.2 Fragment Table
The Fragment Table (Figure 9) defines the structure of the allo-
cated memory for each code buffer. The table has N entries for
N allocated fragments. Each entry holds two doublewords:
first doubleword - the physical address of the fragment (must
be doubleword aligned).
second doubleword - has the following fields:
- bits 20:1, the fragment length in doublewords (the frag-
ment must be doubleword aligned),
- bit 0, F (“Final” bit), when ‘1’ indicates that this fragment is
the final fragment of the buffer,
- bits 31:21, unused, must be 0.
9.3 JPEG Compression Modes
The sequence of actions performed by the host software and the
ZR36067 is as follows:
The host allocates the first four code buffers and writes out
the code buffer table and the fragment table.
The host loads the ZR36067’s I_STAT_COM_PTR register
with the base address of the code buffer table.
After the start of the compression process, the ZR36067
starts filling the fragments of the first code buffer with the
compressed data of the first field or frame.
After successfully completing transfer of the compressed
data of a field or frame, the ZR36067 writes the status infor-
mation back to the STAT_COM entry of the current buffer. It
sets the STATUS_BIT in the STAT_COM entry, declaring its
content as status. It then issues an interrupt, and starts the
next field or frame process.
If a new code buffer is unavailable at the beginning of a field
or frame process (that is, if the STATUS_BIT of the next
buffer entry is ‘1’), the ZR36067 polls the STAT_COM entry
until the buffer is available.
When the host receives the interrupt, it checks the
STAT_COM entries in the code buffer table. For each entry
whose STAT_BIT=’1’, the host checks F_CNT to determine
whether any fields/frames were dropped. It records the code
buffer information, updates the fragment table and
STAT_COM entry of the code buffer, and returns it by reset-
ting STAT_BIT to ‘0’.
Several scenarios might cause a field or frame process to be
unsuccessful:
The allocated code buffer memory was smaller than the ac-
tual field/frame code volume (the ZR36067 fills the final
fragment, but the field/frame code transfer is not complete).
A ZR36060 strip memory overflow occurs during the field/
frame compression (might be caused by very large PCI bus
latency).
The compression of a field has not ended by the time the
trailing edge of the next VSync is detected.
After an unsuccessful field/frame process in compression, the
ZR36067 does not issue an interrupt, re-uses the current code
buffer - that is, does not over-write its STAT_COM entry, and
restarts with the next field or frame. The software can determine
the number of fields or frames that were skipped by reading
F_CNT.
9.4 JPEG Decompression Modes
The sequence of actions performed by the host software and the
ZR36067 is as follows:
The host allocates the first four code buffers and writes out
the code buffer table and the fragment table.
Table 10: STAT_COM entry content, when
STAT_BIT=0
Bit
Content
Description
31:2
FRAG_TAB_PTR[31:2]
The address pointer to the
fragment table of the next buffer
to be used. The 2 l.s. bits of the
address must be ‘0’ - that is, the
address must be doubleword
aligned.
1
FRAG_TAB_PTR [1]
Must to be ‘0‘.
0
STAT_BIT
Must be ‘0’ to indicate that the
table entry is a command.
Table 11: STAT_COM entry content, when
STAT_BIT=1
Bit
Content
Description
31:24
F_CNT[7:0]
The serial number, modulo 256, of the
most recent field or frame. Used in
compression only.
23
Reserved, set to ‘0’.
22:1
F_LENGTH[21:0]
The length of the most recently com-
pressed field or frame in bytes, used in
compression only. The length is dou-
bleword aligned, so bits 2..1 are
always ‘0‘.
0
STAT_BIT
‘1‘, indicating that this table entry is a
status written by the ZR36067.
相關PDF資料 |
PDF描述 |
|---|---|
| ZR36067PQC | AV PCI CONTROLLER |
| ZR36067 | PCI Adapter Intended for Multimedia Applications on PCI Systems(PCI（外圍部件互連）適配器（用于PCI系統(tǒng)的多媒體）) |
| ZR36215 | SupraAV SVCD Decoder(SupraAV 超級VCD解碼器) |
| ZR36419 | Digital Camera Processor(數(shù)字攝影處理器) |
| ZR36420 | Digital Camera Processor(數(shù)字攝影處理器) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ZR36067PQC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AV PCI CONTROLLER |
| ZR36067PQC-LV | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral IC |
| ZR36100PQC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Audio/Video Decoder for MPEG |
| ZR36110PQC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Audio/Video Decoder for MPEG |
| ZR36120PQC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。