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參數(shù)資料
| 型號： | PCD5013H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 尋呼電路 |
| 英文描述： | FLEX roaming decoder II |
| 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)： | 15/76頁 |
| 文件大?。?/td> | 270K |
| 代理商： | PCD5013H |
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1999 Apr 12
15
Philips Semiconductors
Product specification
FLEX
roaming decoder II
PCD5013
8.4
Configuration and synchronisation
8.4.1
G
ENERAL
After a reset, all configuration data has to be (re)loaded
into the PCD5013 by the host using the SPI. PCD5013
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). PCD5013 features
which can be changed during operation are configured
using the control packet. The checksum packet ensures
proper communication between the host and the
PCD5013.
8.4.2
SPI
SECURITY ALGORITHM
The PCD5013 provides a security algorithm to verify
correct SPI operation (Figs 9 and 10). The PCD5013
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 PCD5013 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 PCD5013 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.
Checksum packets sent when the SPI transmit is enabled,
are ignored by the PCD5013 irrespective of the value of
the checksum packet data bits. Thus when the PCD5013
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 PCD5013
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 a receiver shutdown
packet is pending, the receiver shutdown packet is sent. If
there is no receiver shutdown packet pending, but there is
a roaming status packet pending, the roaming status
packet is sent. If neither the receiver shutdown packet nor
the roaming status packet is pending and there is data in
the transmit buffer, the PCD5013 initiates an SPI transfer
sending a packet from its transmit buffer. The PCD5013
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
MGR618
ROAMING STATUS REGISTER
STATUS REGISTER
SPI
SECURITY
ALGORITHM
MUX
SPI TRANSMIT REGISTER
MISO
32
×
32 DATA PACKET
FIFO TRANSMIT
BUFFER
32
RECEIVER SHUTDOWN REGISTER
32
PART ID REGISTER
32
32
32
32
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