參數(shù)資料
型號(hào): TSB42AA4PGE
廠商: Texas Instruments, Inc.
英文描述: IEEE 1394 A CONSUMER ELECTRONICS LINK LAYER CONTROLLER
中文描述: 1394消費(fèi)電子產(chǎn)品鏈路層控制器
文件頁(yè)數(shù): 87/183頁(yè)
文件大?。?/td> 798K
代理商: TSB42AA4PGE
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522
data into ceLynx. ceLynx is responsible for smoothing the incoming data so that the receive buffer, which
has a depth much less than a frame, does not overflow. It is assumed that at the receive node data is read
out of the receive buffer at a constant rate. The actual rate is determined by the frame frequency. The frame
frequency is determined by a PLL driven by the DV_Frame_Out signal of ceLynx.
Specification 61883-2 defines that either a packet of data (480 bytes for NTSC) or an empty packet must
be sent every ISO cycle. To reduce the speed at which data is sent to the receive buffer, empty packets are
evenly distributed throughout the frame.
Transmit Delay Time Td
1
2
3
4
5
Td
Td
Frame Pulse
DV Packets
From a Burst
Codec
DV Packets
From a HDD
Assumed to be
Constant Regulated by
Water Marks
DV Stream That
Is Delayed by the
Transmit Time Counter
But Without
Smoothing
DV Stream That
Is Smoothed. The Input
Could Be Either of the
Streams Shown Above
When an ISO cycle occurs during this gap an empty packet will be inserted.
It is possible for up to two empty packets to occur during this gap.
Figure 524. DV Smoothing
ceLynx determines the number of empty packets to insert automatically by counting the length of the DV
frame. The DV frame is based on a 29.97 Hz clock which has a required accuracy of 1%. The DV frame can
be as long as 33.704 ms and as short as 33.036 ms. The number of empty packets inserted into the stream
can range from 14.2 to 19.6. Table 519 shows the relationship between the frame length and the number
of insertion packets automatically insert into the stream. The extra empty packets are inserted during the
transmit delay time as previously described.
Table 519. Automatic Empty Packets Relative to Frame Length, NTSC Only
MAX FRAME
(
μ
s)
MIN FRAME
(
μ
s)
AVERAGE
NUMBER
AUTOMATIC
EMPTY PACKETS
INSERTED
33700
33650
19
< 33650
33525
18
< 33525
33400
17
< 33400
33275
16
相關(guān)PDF資料
PDF描述
TSB42AA9I STORAGELYNX 1394 LINK-LAYER CONTROLLER FOR ATA/ATAPI STORAGE PRODUCTS
TSB42AA9IPZT STORAGELYNX 1394 LINK-LAYER CONTROLLER FOR ATA/ATAPI STORAGE PRODUCTS
TSB42AB4I IEEE 1394 A CONSUMER ELECTRONICS LINK LAYER CONTROLLER
TSB42AB4PGE IEEE 1394 A CONSUMER ELECTRONICS LINK LAYER CONTROLLER
TSB43AA82A1 1394 integrated PHY and link layer controller(1394集成PHY和鏈路層控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TSB42AA4PGER 制造商:Rochester Electronics LLC 功能描述:- Bulk
TSB42AA9 制造商:TI 制造商全稱:Texas Instruments 功能描述:STORAGELYNX 1394 LINK-LAYER CONTROLLER FOR ATA/ATAPI STORAGE PRODUCTS
TSB42AA9A 制造商:TI 制造商全稱:Texas Instruments 功能描述:StorageLynx 1394 Link-Layer Controller for ATA/ATAPI Storage Products
TSB42AA9APZT 功能描述:1394 接口集成電路 Hi Perf 1394a 3.3V Link-Layer Cntrlr RoHS:否 制造商:Texas Instruments 類型:Link Layer Controller 工作電源電壓: 封裝 / 箱體:LQFP 封裝:Tray
TSB42AA9APZTG4 功能描述:1394 接口集成電路 3.3V Link-Layer Cntrlr RoHS:否 制造商:Texas Instruments 類型:Link Layer Controller 工作電源電壓: 封裝 / 箱體:LQFP 封裝:Tray