TMC2084-HT Ver la hoja de datos (PDF) - SMSC -> Microchip
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TMC2084-HT Datasheet PDF : 74 Pages
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Standalone Mode CircLinkTM Controller
Datasheet
2.2 Initial Configuration
Initial configuration can be performed two ways: through shared pins or through the network.
2.2.1 Configuration Using Shared Pins
Basic items related to communication are configured using the shared pins. The configuration is performed
after reading the states of pins PD7 - 0 and TXD at the rising edge of the reset signal. Since these pins
remain in their high-impedance states (input states) during reset, connecting pull-up resisters to them
causes High level input and connecting pull-down resisters to them causes Low level input. The items
configured here are essential to send or receive packets within the network. Additional detail items may be
configured if necessary using configuration through the network as described below.
nCMIBYP
This pin specifies whether CMI coding is bypassed.
(Shared with TXD)
Low: the CMI coding is bypassed
(RZ coding for HYC4000/2000)
High: the CMI coding is not bypassed. (CMI coding for RS-485/CAN transceiver)
NID3 - 0
These three pins specify the node ID within the range 1 through 15.
(Shared with PD3 - 0) NID3 and NID0 correspond to MSB and LSB respectively. Low causes 0; High
causes 1. When PSSL is set to Low, NID3 causes 0.
Note: DO NOT set low level for all pins.
PSSL
This pin selects the page size.
(Shared with PD4)
Low: 128 bytes/page (the maximum number of nodes = 7): All of the NID3,
MAXID3 and CMID3 bits are fixed to 0.
Burst Transmission Period = 1.07 ms × 2.5/R (R = Transmission Rate in Mbps)
High: 64 bytes/page (the maximum number of nodes = 15)
Burst Transmission Period = 0.79 ms × 2.5/R (R = Transmission Rate in Mbps)
Two types of page sizes out of the four types that TMC2072/74 supports can be configured for TMC2084:
64-byte and 128-byte modes. A common page size must be configured for all nodes including host nodes.
The data size that TMC2084 can send to or receive from the host in all modes is only the 8 bytes that are
taken from the page; 64 bytes or 128 bytes of data can be transmitted only between host nodes.
PGS2 - 0
These three pins specify I/O port direction as shown in the table below.
(Shared with PD7 - 5)
Revision 0.1 (03-31-06)
Page 16
DATASHEET
SMSC TMC2084
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