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prot_fatfury2.cpp: Fix bitswap, Add notes (#7331)

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* prot_fatfury2.cpp: Fix bitswap, Add notes

* prot_fatfury2: typo

* prot_fatfury2.cpp: Fix copy-paste issue
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cam900 2020-10-06 23:07:42 +09:00 committed by GitHub
parent a25dbaad04
commit 0cf5ca4eba
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1 changed files with 13 additions and 3 deletions
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16
src/devices/bus/neogeo/prot_fatfury2.cpp
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@ -41,7 +41,12 @@ uint16_t fatfury2_prot_device::protection_r(offs_t offset)
m_pro_ct0->h_w(BIT(offset, 2));
u8 gad = m_pro_ct0->gad_r();
u8 gbd = m_pro_ct0->gbd_r();
return (BIT(gbd, 0, 2) << 6) | (BIT(gbd, 2, 2) << 4) | (BIT(gad, 0, 2) << 6) | (BIT(gad, 2, 2) << 4);
/*
Data pin from PRO-CT0
D0 D1 D2 D3 D4 D5 D6 D7
GAD2 GAD3 GAD0 GAD1 GBD2 GBD3 GBD0 GBD1
*/
return (BIT(gbd, 0, 2) << 6) | (BIT(gbd, 2, 2) << 4) | (BIT(gad, 0, 2) << 2) | (BIT(gad, 2, 2) << 0);
}
@ -55,8 +60,13 @@ void fatfury2_prot_device::protection_w(offs_t offset, uint16_t data)
m_pro_ct0->h_w(BIT(offset, 2)); // A3
// C16-31 = A4-A19, C0-C15 = D0-D15
m_pro_ct0->c_w((u32(bitswap<16>(BIT(offset, 3, 16), 15, 13, 11, 9, 14, 12, 10, 8, 7, 5, 3, 1, 6, 4, 2, 0)) << 16) |
bitswap<16>(data, 15, 13, 11, 9, 14, 12, 10, 8, 7, 5, 3, 1, 6, 4, 2, 0));
/*
Address/Data pin mapping into PRO-CT0
C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 LOAD EVEN H
D0 D4 D1 D5 D2 D6 D3 D7 D8 D12 D9 D13 D10 D14 D11 D15 A4 A8 A5 A9 A6 A10 A7 A11 A12 A16 A13 A17 A14 A18 A15 A19 A1 A2 A3
*/
m_pro_ct0->c_w((u32(bitswap<16>(BIT(offset, 3, 16), 15, 11, 14, 10, 13, 9, 12, 8, 7, 3, 6, 2, 5, 1, 4, 0)) << 16) |
u32(bitswap<16>(data, 15, 11, 14, 10, 13, 9, 12, 8, 7, 3, 6, 2, 5, 1, 4, 0)));
// release /PORTOEL
m_pro_ct0->clk_w(false);