參數(shù)資料
型號(hào)： PCD5008H
廠商： NXP SEMICONDUCTORS
元件分類： 尋呼電路
英文描述： FLEX Pager Decoder
中文描述： TELECOM, PAGING DECODER, PQFP32
封裝： 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, SOT-358-1, LQFP-32
文件頁數(shù)： 14/64頁
文件大小： 341K
代理商： PCD5008H
1998 Jun 17
14
Philips Semiconductors
Product specification
FLEX
Pager Decoder
PCD5008
8.4
Configuration and synchronisation
8.4.1
G
ENERAL
After a reset, all configuration data has to be (re)loaded
into the PCD5008 by the host using the SPI. PCD5008
features which do not change during operation are
configured using the configuration packet (Section 8.4.4),
the receiver control packets (Section 8.5) and the address
configuration packets (Section 8.6). PCD5008 features
which can be changed during operation are configured
using the control packet. The checksum packet ensures
proper communication between the host and the
PCD5008.
8.4.2
SPI
SECURITY ALGORITHM
The PCD5008 provides a security algorithm to verify
correct SPI operation (Figs 9 and 10). The PCD5008
maintains a checksum register equal to the result of
XORing the 24 data bits of every packet it receives, except
the checksum packet 00H and special packets
1CH to 1FH. When the PCD5008 is reset, the internal
checksum register is initialized to the 24 bit part ID defined
in the part ID packet.
Immediately following a reset and whenever the host
sends a packet other than a checksum packet, the
SPI output of status and data (SPI transmit) is disabled.
The PCD5008 then initiates SPI transfers continuously,
sending the part ID packet (Section 8.4.5). Note that when
SPI transmit is disabled all decoding and timing functions
are unaffected. The SPI transmit can be enabled by
sending a checksum packet for which the checksum value
matches the checksum register.
Any checksum packets sent when the SPI transmit is
enabled, are ignored by the PCD5008 irrespective of the
value of the checksum packet data bits. Thus when the
PCD5008 initiates an SPI transfer and the host has no
data to send, the host should send the checksum packet
so as not to disable the SPI transmit. The data in the
checksum packet could be a null packet (32 bit stream of
all zeros).
Sending a packet other than the checksum packet when
the SPI transmit is enabled causes the SPI transmit to be
disabled until a checksum packet is sent with the correct
value. Thus when the host re-configures the PCD5008
after a reset, the SPI transmit is disabled until the host
sends a checksum packet at the end of the configuration
data, with the checksum value equal to the result of
XORing together the data bits of each of the configuring
packets and the data bits of the part ID packet.
If the SPI transmit is enabled and there is data in the
transmit buffer, the PCD5008 initiates an SPI transfer
sending a packet from its transmit buffer. The PCD5008
sends the status packet (which is not buffered) when the
host initiates an SPI transfer and the transmit buffer is
empty.
Fig.9 SPI transmit functional block diagram.
handbook, full pagewidth
MGK261
PART ID REGISTER
STATUS REGISTER
MUX
SPI TRANSMIT REGISTER
MISO
32
×
32 DATA PACKET
FIFO TRANSMIT
BUFFER
SPI
SECURITY
ALGORITHM
32
32
32
32
相關(guān)PDF資料
PDF描述
PCD5013 FLEX roaming decoder II
PCD5013H FLEX roaming decoder II
PCD5032 ADPCM CODEC for digital cordless telephones
PCD5032H ADPCM CODEC for digital cordless telephones
PCD5032T ADPCM CODEC for digital cordless telephones
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCD5008HBD-T 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication Decoder
PCD5013 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:FLEX roaming decoder II
PCD5013H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:FLEX roaming decoder II
PCD5032 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:ADPCM CODEC for digital cordless telephones
PCD5032B 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Linear CODEC
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