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DPC31 HW

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DPC31 HW Description

Version V1.0 Page 19

=1 The ‘New_GC_Command Int’ is generated for each receipt of a GC

message.

XAsyn/Syn: Setting the bus physics

=0 Asynchronous physics; the work clock pulse is fixed at 48 MHz (via PLL)

Baudrate: 9.6 kBd to 12 MBd (basic setting)

=1 Synchronous physics; the work clock pulse can be set: 2, 4, 8 or 16 MHz

Baudrate: fixed at 31.25 kBd

En_Change_Cfg_Buffer: Enable of the

buffer exchange (User_Cfg_Buffer for MAC_GCfg_Rbuffer)

=0 The buffers won’t be exchanged.

=1 With ‘User_Cfg_Ok Cmd’, the above-mentioned buffers are exchanged. The

exchange is confirmed with the interrupt ‘Get_Cfg_Buffer_Changed’ .

Syn_Clkin

1..0

: Setting the external clock pulse supply at Pin XTAL1_CLK (not via PLL). The internal

C31 processes with half the clock frequency!

=00 External clock = 2 MHz ⇒ Baudrates: 31.25 (not released!)

=01 External clock = 4 MHz ⇒ Baudrates: 31.25

=10 External clock = 8 MHz ⇒ Baudrates: 31.25

=11 External clock = 16 MHz ⇒ Baudrates: 31.25

Preamble

1..0

: For the syn. physics, the preamble length is parameterized in number of bytes.

=00 ⇒ 1 byte

=01 ⇒ 2 bytes

=10 ⇒ 4 bytes

=11 ⇒ 8 bytes

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 93 94

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Siemens SPC3 Dokumentacja Strona 21