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srishyla_ks
New User
Joined: 07 Jun 2005
Posts: 2
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Hi, can anyone please tell me, why MVC insruction can move a maximum of 256 byte data
thanks in advance |
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jon_s_rice
Active User
Joined: 24 Mar 2005
Posts: 102
Location: Douglasville, GA USA
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| The length of the field is contained in a single byte of the instruction. |
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KMK
New User
Joined: 29 Jul 2005
Posts: 18
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Hi,
To be more precise MVC instruction is of SS format
MVC D1(L,B1),D2(B2)
ie bit position are as follows
D1 0 - 8
L 9 - 16
B1 17 - 20
D1 21- 32
B2 33 - 36
D2 37 - 47
Where L ie length occupies only 8 bits hence 2 power 8 = 256 it can hold.
Hence we can move only data of length 256. |
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ap_mainframes
Active User
Joined: 29 Dec 2005
Posts: 181
Location: Canada
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Hi,
MVC is a SS type of instruction and in these type of instructions Length is of 1 byte.So the maximum FF can be accomodated hence the operation carried out can have a limit of 256 bytes.
Hope this answers. |
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